HG23:
Hey brother, I certainly don't mean to preach or rag on you...but if you're doing some tokin', on the sauce and you're concerned about muscle growth??? You may wish to view your priorities. Smoking has a negative effect on the lungs, so well publicized I won't get into it, and the 'roids will take their toll on you eventually, no matter what anyone else tells you[businesses are out to make a buck, period], and the toking has legal issues - whether it will this or that for you isn't an issue, as it is illegal at this time.
Sadly, choices we make in our twenties WILL come back as health issues in our 40's and above, and you will find this out in time. There is no such thing as a "harmless" drug, it has effects - good and bad, or else why would it be worth taking? Just my 2 cents. Good luck brother.
Hope I helped...