Yes. Most states that sell legal weed will sell it like alchohol and cigarettes, if you have a valid ID and you're of age to purchase you're ok.
Yes. As long as you are 21& your ID is current and valid. FYI: If you're from a state where it's not legal, I don't advise trying to bring any product back, especially by plane.
As long as it is valid and not expired, yes.
Yes
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