A clogged vape cart or a leaking one is frustrating, but the cause is usually simple: oil too stiff to reach the heating element, or thin enough to wander where it shouldn’t. Start with the quick fixes below, since most problems clear in a few minutes. Then use the prevention habits so it doesn’t happen again, and learn the signs that a cart is past saving.
Quick fixes for a clogged vape cart
Try these in order, and stop as soon as the cart pulls normally:
- Warm it gently. Hold the cart in your hand or keep it in an inside pocket for a few minutes. If your battery has a preheat function, run it once or twice.
- Take a slow draw without firing. On a button battery, inhale gently without pressing the button to loosen oil sitting in the airway. Don’t pull hard.
- Check the connection. Unscrew the cart, make sure the threads and the center contact are clean, and screw it back on until it’s snug but not tight.
- Charge the battery. A low battery can feel like a clog, with weak vapor or none at all.
- Start low. Try the lowest setting first, then step up one level if the vapor is still thin.
For a leak, wipe away the oil, stand the cart upright for a while, check the threads, and stop pulling hard on a cart that gurgles.
Never open a cart, push anything deep into it or try to refill it. If these steps don’t work, stop troubleshooting and see when to replace it, below.
What’s happening inside: oil thickness, gravity, heat and airflow
A cart is a small reservoir of thick oil sitting on a heating element, with an air path running up the middle to the mouthpiece. Four things decide whether it behaves:
- Oil thickness. Cannabis oil is naturally thick, and it gets thicker as it cools. Cold oil flows slowly to the heating element, and vapor that cools in the airway can condense and set there. That’s the classic clog.
- Gravity. Oil goes wherever the cart points. Stored on its side or upside down, it can creep into the air path, which leads to gurgling and leaks.
- Heat. Warm oil thins out and moves more easily, which helps in moderation. Too much heat, from the sun, a hot car or a high setting, thins it enough to seep out.
- Airflow. Every pull draws air past the oil. Gentle draws carry vapor; hard, fast pulls can drag liquid oil into the air path and flood it.
That’s why Michigan’s seasons are hard on carts. A car in January can leave oil sluggish, and a car in August can make it run.
Preventing clogs: pull style, storage and preheat
- Pull slowly and steadily, a little longer and gentler than you would through a straw, rather than in short, hard bursts.
- Keep it at room temperature. In winter, carry carts indoors or in an inside pocket instead of leaving them in a cold car.
- Use preheat in the cold. If your battery has it, a preheat cycle warms thick oil gently before you draw.
- Use it now and then. A cart that sits untouched for weeks is more likely to set up in the airway.
Preventing leaks: upright storage, heat and thread tightness
- Store it upright, mouthpiece on top, including in a bag or a drawer. A small cup or stand helps.
- Keep it out of heat. FDA advises keeping vapes out of direct sunlight and out of a car on a hot day, which protects the battery and keeps the oil from thinning out.
- Get the threads right. Screw the cart on until it’s snug. Too loose and the connection is poor; too tight and you can damage the seals or the battery contact.
- Go easy on the setting. High heat thins the oil and can push it out of the cart.
Which setups give fewer problems
Hardware choices affect how often you’ll troubleshoot:
- Disposables pair a battery with oil made for it, so there’s no thread to tighten and usually no setting to get wrong. The trade-off: if one fails, you can’t swap the battery.
- Cart and battery setups give you control. A battery with adjustable settings and a preheat function copes with thick oil and cold weather better than a single-setting pen.
- Ceramic or cotton. Many carts use a porous ceramic core that holds oil against the heating element; others use a cotton wick that soaks it up like a lamp wick. Either can work well, but cotton can scorch if it runs dry.
Our guides to disposable vapes and vape pens cover the hardware in more detail, and our THC vape buying guide helps you match a cart to a battery.
Why does my vape taste burnt?
A burnt taste usually means the heating element is running hotter than the oil can keep up with. The setting may be too high, you may be taking pull after pull without a break, or the cart may be nearly empty, leaving the core dry. Drop the setting and slow down. Flavor also depends on the oil’s terpenes, which high heat can scorch; our guide to terpenes in vape oil explains more. If a cart with plenty of oil still tastes burnt on the lowest setting, the core is likely scorched for good.
When to replace instead of troubleshoot
Some problems aren’t worth fighting:
- The cart still won’t pull after warming, gentle draws and a clean connection.
- It leaks again soon after you’ve stored it upright and checked the threads, or you can see a crack.
- It tastes burnt on the lowest setting even with oil left.
- The battery is damaged, wet or swollen, or it gets hot to the touch. FDA advises replacing vape batteries that get damaged or wet, and fire safety guidance says to stop using a battery that overheats or swells.
If a product seems defective, contact or visit the store where you bought it; each store’s details are on our store pages. When a battery or disposable reaches the end of its life, recycle it. EPA advises keeping lithium-ion batteries and the devices that contain them out of household trash and curbside recycling bins, and taking them to a battery recycling or household hazardous waste drop-off instead.
Habits that shorten a cart’s life
- Leaving it in a car, hot or freezing.
- Running it on the highest setting by default.
- Taking pull after pull without a break, which overheats the core.
- Storing it on its side or upside down.
- Overtightening it onto the battery.
- Pulling hard on a cart that’s already clogged or gurgling.
- Jamming a cart onto a battery it wasn’t made for, such as a wide cart in a narrow sleeve.
- Adding anything to the oil. CDC advises against adding any substance not intended by the manufacturer to a vape product, including products bought in stores.
Cleaning a sticky mouthpiece or battery contacts safely
Oil on the outside of a cart or on the battery threads is common and easy to clean:
- Unscrew the cart, and switch the battery off if it has a switch.
- Lightly dampen a cotton swab with isopropyl alcohol and wipe the outside of the mouthpiece, the cart’s threads and the battery’s threaded connection.
- Use a dry swab or paper towel to lift loose oil from the top of the battery, without pushing liquid into it.
- Let everything dry completely before you reconnect. Isopropyl alcohol is flammable.
- Don’t soak, rinse or take apart a cart or battery, and never push anything into the mouthpiece.
A little oil on the outside doesn’t mean a cart is ruined. A lot of oil, or oil that keeps coming back, points to a leak worth replacing.
Vape pens and carts are part of High Society’s menus, though selection varies by store. Browse your store’s online menu, order ahead for in-store or curbside pickup, and ask our budtenders for hardware that suits how you vape. 21+ only. Please consume responsibly.
