Cmon, be honest....which brothers here take a COUPLE of tokes a day after training to relax after an intense session and to help increase their appetite? Think it will seriously hault your progress?
as far as the substance itself, it has little to no effect on gains. you could say all you want about carcigens blah blah blah
but fact is it plays a minimal role. just don't let it fuck with your motivation. be timely with your smoking if you know you're gonna be lazy as result.