Not so much cigarettes but marijuana. It started affecting my school work and It kind of withdrew me from my family and friends. Plus all the times I've been nearly arrested, it's just not worth it anymore. In all honesty though, I do not blame the actual marijuana for this. I blame myself for not having self control with it and being more responsible about it. Anyways, I've tried quiting a bunch of times and I never have any luck. Anybody got any useful tips to help me out?