dude first off, your a fucking idiot, no offense. The reason you are an idiot is because you can wrap food in tin foil, but it won't affect the food in any way because IT IS NOT BEING BURNT. when you smoke out of tin foil, the chemicals will fuck your lungs up and it is a proven fact. Secondly, don't smoke at school. I had a friend in my senior year last year and he smoked on the last day of school and got busted, he wasn't able to graduate. ITS NOT WORTH IT MAN. BE FUCKING SMART ABOUT SMOKING ITS NOT SOMETHING YOU NEED. DO IT AT THE APPROPRIATE TIME.
but if anything, do it before school