I have only smoked weed once, and have been scared to death of weed ever since from experiencing a terrible trip. Since then, I was once in a room full of people smoking pot, and I experienced the same thing just from being surrounded by the smoke. I do not, and never have, been constant friends with pot smokers. This was in the beginning of high school, and it was at a couple big parties. since those couple times, I have no longer put myself in those situations and with those people. The problem is, later this month I will be attending a concert to see a band I have always wanted to see, but their fans are typically heavily associated with drugs, so I am sure there will be a ton throughout the concert. Is there anything I can do to block the smoke from entering my system? Like breathing through my sweatshirt sleeve when i smell it or something to that effect? I am nervous that I will experience another freakout like in the past (which I NEVER want to have again obviously) from smelling and being around the stuff. Any ideas? Thanks!