A THC vape is a small battery-powered device that heats cannabis oil until it becomes vapor, and you pull that vapor into your lungs. No flame, no smoke, no ash. The oil sits in a cartridge or pod, a wire or ceramic coil inside gets hot, and the cannabinoids and terpenes vaporize somewhere around 315°F to 400°F. That's the whole trick.

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The details are what separate a smooth, flavorful hit from one that burns your throat and clogs by Wednesday. Here's what happens inside the hardware.

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What's inside a THC cartridge

Most carts on the legal market hold one of four things:

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Thicker oils need more heat. That's why a rosin cart can hit weak on a battery set to low voltage while a thin distillate cart burns fine at the same setting.

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How the coil turns oil into vapor

Inside the cart, a wick feeds oil to a coil. Press the button or pull on the mouthpiece, and current from the battery runs through that coil. Resistance makes it hot, the oil touching it vaporizes, and airflow carries the vapor up the center tube to your mouth.

Older carts use cotton wicks and kanthal wire. Newer ones use porous ceramic, which heats without hot spots and handles thick oil without scorching. Ceramic costs more and it's worth it. Cotton tastes burnt fast once the oil runs low.

Voltage, wattage, and why temperature matters

Terpenes vaporize at lower temperatures than cannabinoids. Push a battery to 4.2 volts and you get a big cloud plus a bitter, burnt edge. Drop to 2.4 or 2.8 volts and you get more flavor with a thinner hit. Most people land around 3.3 to 3.8 volts for a balance of both.

THC itself boils near 315°F. Combustion, where plant material catches fire and creates smoke and tar, starts closer to 450°F. A vape never reaches that point, which is the core difference between vaping and smoking. Nothing is burning.

Inhale-activated vs button batteries

Draw-activated batteries fire when you pull. Nothing to press, nothing to forget. Button models give you a preheat cycle and control over the length of each hit, which helps with thick live resin.

510-thread batteries accept almost any cartridge. Pod systems and disposables lock you into one brand's hardware. Both work. The tradeoff is control versus convenience.

What you feel and when

Inhaled THC reaches the bloodstream through the lungs and crosses into the brain within minutes. Most people notice effects in under 5 minutes and peak around 30 minutes. The high fades over 1 to 3 hours. That's much faster than an edible, which has to pass through the liver first and can take 30 to 120 minutes.

Inhaled THC bioavailability runs roughly 10 to 30 percent, meaning a good chunk of what you exhale never made it in. This is also why a vape hits harder than the milligram number on the label suggests when you compare it to an edible with the same count.

Why carts clog and spit

Keep carts upright, at room temperature, and take slow draws. Most clogging is a storage problem, not a hardware problem.

Safety notes that matter

Legal, lab-tested carts from licensed producers are the baseline. Unregulated carts have been tied to vitamin E acetate and serious lung injuries. The CDC traced a 2019 outbreak of vaping-related illness to that additive in black-market products. If a cart costs half of what everything else costs and shows up in a plastic bag with no batch number, skip it.

And vaping is not harmless. It delivers a concentrated dose fast, tolerance builds quickly, and daily use raises the odds of dependence. Start low on voltage and short on draws, especially with a cart you haven't tried before.