Isn't nicotine a vaso-constrictor? I used to dip cope before i starting lifting weights. It was an appetite suppresant for me, therefore after i quit, I started eating alot more. I guess everyone is different, but it makes me tired if i'm doing it while exerting myself. My brother knew of a guy that would dip in the gym. If I did that, I know my workouts wouldn't be worth a sh**