That sudden rush of anxiety you get when preparing to smoke a bowl of weed for the first time in a while. It involves deep breaths and a slightly raised heart-rate. It can of course turn into a panic attack if you don't hurry up and smoke.
Person 1: Come on man, hurry up and smoke already.
Person 2: Chill out, I will a min, just got a wee bit of pre-smoke anxiety.
Person 1: Pussyyyy