You're on a first date, everything is going smoothly, then your date lights up a cigarette when you both get outside. Now for most people this is a major turn-off, enough to use as a deciding factor on whether there will actually be a 2nd date. Yes, it is a nasty habit (also life threatening) yet every day people struggle with kicking this addiction. Zenhabits.net creator Leo Babauta write his tips for quitting smoking here.