If you are focused enough to stay realy motivated, smokin the ganj while not hinder your gains, however, binge drinking seriously inhibits muscle growth. This is a scientific fact. Alchohol saturation, depletes nutrients from your blood stream, dehydrates your muscles, and fucks up your sleeping and eating patterns. While you may think you can sleep like a rock when you are sloshed, your brain is actualy in a state which decreases your bodies ability to recover.