Vapes — What They Are, How They Work & What You Need to Know

Vapes — What They Are, How They Work & What You Need to Know

The global vape market hit $28.17 billion in 2023, with annual growth projections of 30.6% through 2030 according to Grand View Research. Yet most people who buy vapes still don't understand the fundamental mechanism separating them from combustible products. That gap matters because vapes operate on heat control, not burning, and the difference affects everything from nicotine delivery efficiency to long-term health outcomes. The industry moved from niche harm-reduction tool to mass consumer product in under 15 years, but the science, regulation, and product quality standards haven't kept pace.

We've spent years analyzing vape product data, reviewing third-party lab reports, and tracking regulatory shifts across nicotine and cannabis markets. The pattern is consistent: buyers who understand the core technology make better purchasing decisions, experience fewer device failures, and avoid the products with the highest contamination risk. This isn't about preference or lifestyle. It's about knowing what you're inhaling and whether the device you're holding was manufactured to a verifiable standard.

What are vapes and how do they work?

Vapes are battery-powered devices that heat a liquid or concentrate to its vaporization point. Typically between 200°C and 300°C. Without reaching combustion temperature. The liquid (called e-liquid, vape juice, or oil depending on the product) contains a base of propylene glycol (PG), vegetable glycerin (VG), or a carrier oil, plus flavoring and the active ingredient (nicotine, THC, CBD, or none). When heated, the liquid turns to an aerosol that users inhale. Unlike cigarettes, which burn tobacco at 900°C and produce tar and carbon monoxide, vapes produce no smoke or combustion byproducts. The health implications depend entirely on what's in the liquid and whether the device itself introduces contaminants during heating.

Vapes aren't one technology. They're a category spanning disposable nicotine sticks, refillable pod systems, box mods with adjustable wattage, and cannabis oil cartridges. What they share is the heating mechanism. What separates them is build quality, ingredient transparency, and whether the manufacturer conducted third-party testing for heavy metals, pesticides, and thermal degradation byproducts. The lowest-priced vapes on the market routinely fail lab tests for lead, cadmium, and formaldehyde emissions. Contaminants introduced by the heating element itself, not the liquid. That's the part most buying guides skip.

This article covers the core vape categories and how they differ mechanically, the ingredient risks that matter and the ones that don't, what the current research actually shows about comparative harm, and the product selection criteria that reduce contamination risk. You'll also see the honest gaps in what we know, the regulatory failures that let unsafe products stay on shelves, and the specific questions to ask before buying any vape product.

How Vapes Deliver Active Ingredients

Vapes work by applying controlled heat to a saturated wick or ceramic coil until the liquid reaches its boiling point and converts to vapor. The battery powers a metal coil (usually kanthal, nichrome, or stainless steel) wrapped around a cotton or ceramic wick soaked in e-liquid. When the user activates the device. Either by pressing a button or drawing air through the mouthpiece. The coil heats, the liquid vaporizes, and the user inhales the aerosol. The entire process happens in under two seconds. Nicotine vapes deliver nicotine to the bloodstream through lung absorption in approximately 10–20 seconds, faster than a cigarette but slower than an injection. Cannabis vapes deliver THC or CBD through the same pathway, with onset times of 2–10 minutes depending on the concentrate viscosity and heating temperature.

The efficiency of nicotine or cannabinoid delivery depends on three factors: the heating temperature, the liquid's viscosity, and the airflow design. Higher temperatures produce more vapor but also increase the risk of thermal degradation. The process by which PG and VG break down into formaldehyde and acetaldehyde when overheated. A 2018 study published in Tobacco Control found that vapes operated above 250°C produced formaldehyde at levels comparable to cigarette smoke, while devices kept below 200°C produced negligible amounts. Most disposable vapes and pre-filled pods don't allow temperature adjustment, meaning users have no control over this variable. Refillable systems with variable wattage let users stay in the safer temperature range, but only if they understand the relationship between wattage, coil resistance, and temperature. Which most don't.

The liquid base matters as much as the heating element. PG produces a stronger throat hit and carries flavor better but can cause throat irritation in some users. VG produces denser vapor clouds and has a slightly sweet taste but makes the liquid thicker, which can clog coils in lower-quality devices. Most commercial vapes use a 70/30 or 50/50 PG/VG ratio. Cannabis oil vapes use different carriers entirely. Either propylene glycol, medium-chain triglycerides (MCT oil), or just the cannabis extract itself with added terpenes for viscosity. The 2019 EVALI outbreak (e-cigarette or vaping product use-associated lung injury) was traced to vitamin E acetate, a thickening agent added to illicit-market THC cartridges that breaks down into toxic compounds when heated. Over 2,800 hospitalizations and 68 deaths were linked to this single adulterant. Legal, regulated cannabis vapes don't contain vitamin E acetate, but unregulated products still do.

Types of Vapes and What Separates Them

Vapes fall into five main categories, each with different use cases, cost structures, and contamination risk profiles. Disposable vapes are single-use devices pre-filled with nicotine liquid, sold in gas stations and convenience stores for $8–$15. They contain a non-rechargeable battery, a fixed-output heating element, and enough liquid for 200–600 puffs depending on the model. They're the lowest-barrier entry point but also the highest per-puff cost and the category with the most documented quality control failures. A 2023 analysis by the Campaign for Tobacco-Free Kids found that 34% of disposable vape brands tested exceeded the FDA's nicotine concentration limit of 20 mg/mL, with some hitting 60 mg/mL. Triple the legal threshold.

Pod systems use replaceable cartridges (pods) filled with nicotine liquid, inserted into a rechargeable battery base. Brands like JUUL, Vuse, and SMOK dominate this category. Pods cost $3–$6 each and deliver 200–400 puffs. The advantage over disposables is lower per-puff cost and slightly better build quality because the battery component is reusable. The disadvantage is proprietary lock-in. Each brand's pods only fit that brand's device. Some pod systems use pre-filled pods (closed systems), while others let users refill the pod with any e-liquid (open systems). Open systems offer more control but require users to handle nicotine liquid directly, which carries poisoning risk if spilled or ingested.

Box mods and vape pens are refillable devices with adjustable wattage, replaceable coils, and larger liquid tanks. They range from $30 to $200 depending on features. These devices appeal to users who want full control over vapor production, flavor intensity, and nicotine delivery rate. They're also the only category where users can verify coil material and replace components that degrade over time. The learning curve is steeper. Users need to understand Ohm's law, coil resistance, and wattage limits to avoid dry hits (burning the wick) or overheating. Box mods produce the most vapor and the most visible cloud, which makes them impractical for discreet use but popular in the hobbyist subculture that emerged around vaping in the 2010s.

Cannabis oil cartridges attach to a 510-thread battery (the industry-standard connection) and contain THC or CBD distillate mixed with terpenes for flavor and viscosity. Cartridges cost $20–$60 per 0.5g or 1g, with approximately 100–300 draws per cartridge depending on draw length. The quality variation in this category is extreme. Licensed dispensary products are tested for potency, pesticides, heavy metals, residual solvents, and microbial contamination in most legal states. Black-market cartridges are untested and have been found to contain pesticides, synthetic cannabinoids, cutting agents like vitamin E acetate, and heavy metal contamination from low-grade hardware. The hardware itself. Specifically the heating element and the cartridge casing. Introduces lead, cadmium, and chromium into the vapor if made from unregulated materials.

Dry herb vaporizers heat ground cannabis flower to vaporization temperature without combustion, typically using convection or conduction heating. These devices range from $80 to $400 and appeal to users who want the entourage effect of whole-plant cannabis without smoking. They don't use liquid or cartridges, so they avoid the cutting-agent and heavy metal risks associated with oil vapes. The primary concern with dry herb vaporizers is temperature control. Devices that exceed 230°C can produce harmful combustion byproducts even if visible smoke isn't present. High-quality models (PAX, Storz & Bickel Volcano, DaVinci) include precise temperature control and medical-grade materials. Budget models often lack these features and overheat.

Vapes: Nicotine, THC, CBD & Risk Comparison

Key Takeaways

• Vapes heat liquid or concentrate to vapor temperature (200–300°C) without combustion, avoiding the tar and carbon monoxide produced by burning tobacco or cannabis at 900°C.
• The 2019 EVALI outbreak was caused by vitamin E acetate in illicit-market THC cartridges. Over 2,800 hospitalizations and 68 deaths were traced to this single cutting agent that breaks down into toxic compounds when heated.
• A 2018 study in Tobacco Control found that vapes operated above 250°C produce formaldehyde at levels comparable to cigarette smoke, while devices below 200°C produce negligible amounts. But most disposable vapes and pods don't allow temperature control.
• Licensed cannabis cartridges are tested for potency, pesticides, heavy metals, residual solvents, and microbial contamination in legal markets; black-market cartridges have been found to contain synthetic cannabinoids, pesticides, and heavy metal contamination from unregulated hardware.
• Pod systems and refillable devices cost $0.04–$0.08 per puff versus $0.08–$0.12 for disposables, but require users to handle nicotine liquid directly, which carries poisoning risk if spilled or ingested by children or pets.
• A 2023 analysis found 34% of disposable vape brands exceeded the FDA's 20 mg/mL nicotine limit, with some products testing at 60 mg/mL. Triple the legal threshold and enough to cause nicotine poisoning in new users.

What If: Vapes Scenarios

What If I Buy a Disposable Vape and the Nicotine Strength Isn't Listed?

Don't use it. The absence of nicotine labeling is a regulatory violation and a strong indicator the product wasn't manufactured to safety standards. Unlabeled disposables have been found to contain nicotine concentrations ranging from 2 mg/mL to 60 mg/mL with no way for the user to know which. Nicotine poisoning symptoms include nausea, rapid heartbeat, dizziness, and vomiting. Outcomes that occur at different thresholds depending on the user's tolerance. If a vape doesn't list nicotine strength, assume the manufacturer also skipped testing for heavy metals, formaldehyde emissions, and liquid purity. This is not a theoretical risk. It's the category with the highest failure rate in independent lab testing.

What If I'm Using a Cannabis Cartridge and It Tastes Burnt or Metallic?

Stop using it immediately and discard it. A burnt taste indicates the coil is heating without sufficient liquid saturation (a dry hit), which produces acrolein and formaldehyde. Both respiratory irritants. A metallic taste suggests the heating element itself is degrading and leaching metal particles into the vapor. This happens when cartridges are used past their intended lifespan or when low-quality hardware is heated repeatedly. Neither is safe to continue inhaling. If the cartridge is from a licensed dispensary, report it to the retailer and request a replacement. Most licensed producers honor defect claims. If it's from an unlicensed source, you have no recourse and no way to verify what caused the taste.

What If I Want to Switch from Cigarettes to Vapes but Don't Know What Nicotine Strength to Start With?

Start with a nicotine concentration that matches your current cigarette consumption, then adjust down. A pack-a-day smoker typically needs 12–18 mg/mL nicotine in a standard vape or 35–50 mg/mL in a pod system using nicotine salts (a formulation that absorbs faster). Nicotine salts hit harder and faster, which makes them effective for cigarette replacement but also increases dependence risk if you weren't a heavy smoker to begin with. Most people who successfully switch report that the first week feels incomplete because the nicotine delivery curve is different. Vapes deliver nicotine more slowly than cigarettes, so the immediate satisfaction is lower. That gap closes after 5–7 days of consistent use.

The Regulatory Truth About Vapes

Here's the honest answer: vapes exist in a regulatory dead zone where the rules are clear but enforcement is nearly nonexistent. The FDA requires all vape manufacturers to submit a Premarket Tobacco Application (PMTA) proving their product is 'appropriate for the protection of public health'. But as of 2026, fewer than 5% of vape products on the market have received authorization. The rest are sold illegally, meaning they never underwent toxicology testing, manufacturing inspection, or ingredient verification. The FDA has issued over 1,000,000 warning letters to retailers and manufacturers for selling unauthorized products, but the products remain on shelves because the agency lacks the enforcement capacity to remove them at scale.

The situation is even worse in the cannabis vape market, where federal prohibition means no FDA oversight at all. State regulators require testing in legal markets, but the standards vary wildly. California requires testing for 66 pesticides and 21 heavy metals, while other states test for fewer than 20 contaminants. Black-market cartridges are untested entirely and account for an estimated 50–70% of the cannabis vape market even in legal states, driven by price differences of 40–60% compared to licensed products. When public health agencies investigate vape-related lung injuries, they find unlicensed products in over 80% of cases, yet those products continue circulating because enforcement targets retailers and manufacturers, not users.

The gap between the regulatory framework and the actual market creates a purchasing problem: buyers can't rely on the presence of a product in a store as evidence it's safe or legal. The only reliable signals are third-party lab testing (which fewer than 10% of nicotine vape brands publish) and licensing status (which applies only to cannabis products in legal states). For nicotine vapes, the safest approach is to buy products that have received FDA PMTA authorization. A list published on the FDA website and updated quarterly. For cannabis vapes, buy only from licensed dispensaries that post lab results showing pesticide, potency, and heavy metal testing.

What Vapes Actually Cost Over Time

Vapes look cheap at the point of sale but the per-use cost varies by an order of magnitude depending on the product type. Disposable vapes cost $8–$15 and deliver 200–600 puffs, putting the cost per puff at $0.08–$0.12. A pack-a-day smoker switching to disposables spends $180–$280 per month. Pod systems drop the per-puff cost to $0.04–$0.08 because the battery is reusable. Monthly cost for the same usage level falls to $90–$180. Refillable systems with bottled e-liquid bring the per-puff cost down to $0.02–$0.04, or $40–$90 per month, but require upfront investment in a device ($30–$100) and ongoing coil replacements ($3–$6 per coil, replaced every 1–3 weeks depending on usage).

Cannabis cartridges operate on a different cost structure because they're sold by weight, not puff count. A 1g cartridge costs $30–$60 at a licensed dispensary and delivers 200–400 draws depending on draw length and device settings. Heavy users go through one cartridge per week, putting monthly costs at $120–$240. Black-market cartridges cost 40–60% less but carry contamination risks that licensed products don't. Dry herb vaporizers have the highest upfront cost ($80–$400) but the lowest per-use cost because they heat flower directly. One gram of flower ($10–$20 depending on quality and market) yields 3–6 sessions, putting the per-session cost at $2–$7. Over a year, a dry herb vaporizer user spending $15 per week on flower pays $780 annually, compared to $1,440–$2,880 for cartridge users.

The cost calculation changes when you factor in device longevity and replacement rates. Disposable vapes are discarded after 1–3 days of heavy use. Pod systems last 6–12 months before the battery degrades. Refillable box mods last 1–3 years if maintained properly. Cannabis cartridge batteries last 1–2 years. Dry herb vaporizers last 3–5 years with proper cleaning. The total cost of ownership over three years for a disposable vape user is $6,480–$10,080, compared to $3,240–$6,480 for a pod system user, $1,440–$3,240 for a refillable system user, and $1,500–$2,500 for a dry herb vaporizer user including the device purchase. The cheapest option at the counter is the most expensive option over time.

[CLOSING PARAGRAPH]

The vape you pick matters less than whether you know what's in it. A $12 disposable from a gas station and a $60 cartridge from a licensed dispensary both heat liquid to vapor, but only one was tested for heavy metals, pesticide residues, and thermal degradation byproducts. The industry moved faster than the regulators, which means the burden of verification falls on you. Check for third-party lab reports, buy only from sources that can prove testing, and never assume that availability equals safety. If a product doesn't list its ingredients, nicotine concentration, or lab results, it's not because the manufacturer forgot. It's because they didn't test, or they tested and chose not to publish the results.