I just came on here to ask the same thing. I've only been smoking since october. Weed only that is. Recently hours after a session, I get a slight feeling of discomfort in the left area of my chest. I wouldnt call it pain, more like an annoyance. It wouldn't be cancer or anything right? I have stopped smoking as of yesterday for a while. Hopefully the next time I smoke I dont get this discomfort. Untill then, I'll be making brownies. You guys think it's a heart thing and not a lung thing?