While an 18-year-old can physically bring the electronic device (the battery) of a dab pen on a plane, they face significant legal risks regarding the contents. Per TSA and FAA regulations in 2026, all electronic smoking devices and lithium batteries must be in carry-on luggage and are strictly prohibited in checked bags due to fire safety. However, the TSA’s primary focus is on security, not drug enforcement; if they discover substances containing THC (which is often what "dab pens" carry), they are required to refer the matter to local law enforcement. Since marijuana remains federally illegal in the United States, carrying THC across state lines or through federal airspace is a crime, regardless of whether it is legal in the departure or arrival state. Additionally, while some states have lower ages for tobacco/nicotine use, the federal age to purchase such products is 21. An 18-year-old caught with a pen containing illegal substances or even certain nicotine products could face confiscation, fines, or even arrest depending on the jurisdiction and the specific contents of the "dab."