It depends on the situation. That I am aware of you are allowed to but you must store the battery separate from the vaporizer due to the fact that the batteries are highly flammable and explosive when exposed to changes in air pressure.
Nope
If it has a lithium battery you have to carry it on, you cannot put it in any checked luggage. You arr not permitted to us it on the plane though.
Probably, but I don't know when you can use.
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