The Short Answer
A 1 gram THC cart lasts about 3 to 8 weeks for a moderate user who takes 10 to 20 pulls a day. The same cart can finish in 5 to 14 days for a heavy daily user, and it can stretch past 3 months for someone who vapes a few times a week. A gram of oil holds roughly 300 to 500 average draws. Duration comes down to three things: pulls per day, draw size, and the voltage you run.
Why the Range Is So Wide
Labels state oil weight and THC strength, not puff count. A cartridge holds about 1,000 mg of oil, and most retail oil tests between 60 and 90 percent THC. A 3 second draw at low voltage moves about 2 to 4 mg of oil. Raise the battery setting and each draw moves more oil, so the cart empties faster even though one puff does not feel twice as strong. Tolerance raises the number of pulls you need to feel the same effect. Two people with the same cart and the same battery can land weeks apart on the same oil.
Compare Cart Battery Life vs Cartridge Life: A Practical Guide
Estimate Your Own Cart
- Count your pulls for one normal day and write the number down.
- Repeat the count for two or three more days, then average them. Moderate users usually land between 10 and 20 pulls per day.
- Divide 350 by your daily average. At 15 pulls a day, a 1 gram cart lasts about 23 days.
- Adjust that result down for long deep draws, high voltage, or sharing, and up for short draws at low settings.
What Drains a Cart Faster
- Battery voltage above 3.8 volts, which burns oil hotter and wastes more of it per draw
- Long draws of 5 seconds or more
- Passing the cart around a group
- Leaving the device in a hot car, which thins the oil and causes clogs and leaks
What Makes It Last Longer
- Running 2.5 to 3.3 volts on a variable voltage battery
- Taking 2 to 3 second draws instead of pulling until the cutoff
- Storing the cart upright at room temperature
- Clearing the airway after each pull so oil does not collect in the mouthpiece
Signs a Cart Is Nearly Empty
Oil sits below the intake holes when the cart is low, which shows as a thin film near the bottom of the glass. Vapor gets warmer and thinner, flavor fades, and you start pulling harder for the same hit. Dry hits with a burnt taste mean the wick has run dry. Stop there, because firing a dry coil degrades the hardware and can release off notes into the vapor.
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Convenience and Timing
Most buyers treat a cart as a month of supply and buy the next one before the first one dies. That habit makes convenience the deciding factor in how long a cart actually lasts, because a spare in the drawer means you hit the old one harder near the end. If you want predictable timing, track your daily pulls for a week. The number you get will tell you more about your next cart than any label on the box.