According to the Transportation Security Administration (TSA), puff bars are permitted on flights and may be packed in either your carry-on or personal bag. However, they cannot be stored in the checked luggage of a plane. There are limits on the number of disposable vapes that you can bring on board.
If you are carrying one or a few puff bars, pack them in your carry-on luggage. Airport security is unlikely to give you any issues, and your belongings should pass through without any problems. If necessary, they may ask you to remove the puff bars for individual scanning.
If security suspects any illegal activity, they may inspect your items and ask you a few questions to ensure thoroughness. However, in most cases, you will not have to do anything, and your items will not raise any concerns.
