We do, and that's called cancer;)
Some research indicates that nicotine can influence how existing cancer behaves and spreads, so that's worth considering.
All you haters that give me grief for drinking my daily cup of decaf can shut up now.
Unfortunately it isn't without potential downsides.
RickJWagner•51m ago
I didn’t dig in too deeply, but started drinking a morning cup of sugar free double mocha cappuccino, to help my workouts.
If I’m fooling myself, don’t tell me. I like the cappuccino.