Regrets? I have had a few, but then again, too few to mention.
Actually, like Lizking said, I have some regrets about things I didn't do, more than I have had regrets about things I did do.
About the only thing I regret regarding intake into my body is too much Pepsi. Love the stuff, though I rarely drink the hard stuff anymore. I drink about one Pepsi Edge a day now. Hate diet pop.
I don't drink much beer, probably no more than 2 a week on average.
Never smoked, very happy with that decision.
dago