As a former vaper (lmfao) personally it’s just easier if you save your hits for the bathroom or leave it in the car. They might come find you and kick you out if you do it in the crowd- i saw it happen last time i was there. But if you must, just blow your vapor down like you’re trying to blow cold air (this will prevent huge clouds and usually keeps it away from others!)
They don't sell food beyond small bags of pretzels or chips.