The Choices You Make are Important ~ Substance Use/Abuse and Personal Safety

You find your friends who you thought weren't going to be smoking, but you are taken by surprise to find out that they are. "Come on, it's so cool" "You have to try it!" "All the cool people are smoking." they say. You are feeling uncomfortable, but these are your friends. If everyone's doing it, it cant be so bad right? What do you do?