The biggest change to travel restrictions for e-cigs is that battery-powered devices cannot be packed in checked luggage. This is a safety measure in case a device catches fire mid-flight. This doesn’t impact carry-on luggage, however, so you can still carry your vape on your person or in a carry-on bag.
Electronic cigarettes and vapes are treated the same way as tobacco products when it comes to onboard use, meaning you aren’t allowed to vape in your seat or in a lavatory.
Your vape’s batteries cannot be charged while onboard. When it comes to packing your vape into your carry-on or leaving it in your jacket, make sure the batteries are separated from the device itself for the duration of your travel. This makes going through security checkpoints faster and eliminates the chance of the battery and the device malfunctioning.
Store your e-juice like you would your toiletries—in a sealed plastic bag. Don’t store it in your setup’s tank!
If you’re ever uncertain as to whether or not a component of your vape is allowed on a plane, check with the TSA. They update their prohibited items listings so you know exactly what is and isn’t allowed. If the TSA’s restrictions don’t answer your question, the airline itself will always have a list of prohibited and allowed items for carry-on and checked baggage.