*Alcohol = bad for blood, you get dehydrated = bloodflow gets slower.
*smoking = Smoking is bad, overall slows the growth in your whole body ( ? )...
*Weed = Nothing bad exept from the smoking But if you only smoke a joint or two a week, it's chill
Thats just what I've learnt from my bodybuilding reading
Correct me if i am wrong
I suspect none would be beneficial and all likely have some degree of detrimental effects. I echo the sentiments of Feeble. Pot is likely the least likely to have a negative effect, though the smoke is not good for you.