A friend of mine noticed the gains I was making in the gym and wanted to start working out with me. So, being the observant ARR board member that I am, I made sure his diet, routine, and all that good stuff was in check before we ever stepped foot in the gym. Everything was in place except one thing, he's a smoker. Not heavy, maybe 4 or 5 a day. I told him he should quit, which he assured me he would. During about our third workout together he asked me what the reason was that he needed to quit smoking, to which I told him what I was always told, that you can't workout as hard if you smoke, thus hindering your gains. He brought to my attention the fact that he was going just as hard, if not harder than I was (which I'll admit, he was... the guy's an animal) and I didn't really know what to say... so I told him it will stunt his growth and make him impotent lol but seriously, I never really learned the science behind it... is there anyone who has a solid answer or experience either way? Is there anyone who smokes or know anyone who smokes and actually makes gains? If I'm wrong then I don't want to lie to the guy, but I just don't know what to tell him. Any help?