All the time, they aren't restricted. If you're asking about marijuana, you cannot legally cross state lines with it, so shouldn't take it. Though the TSA isn't generally screening for drugs. Also, having the vape in your carry-on is the preferred way to fly, because those types of batteries are restricted in checked luggage.
Yes. No TSA restrictions through the checkpoints.
They have to go through xray machine but I believe so.
I wouldnt test it especially with the batteries on the samsungs exploding
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