Believe me, I know. I had a pack a day habit for nearly a decade. It's horrible and I'm very glad that I got free from it. When I first started smoking, I didn't care how shitty it made me feel. Over time, I wanted to quit but was in the thick of it. In the end, I quit because I met my then-girlfriend now-wife and she wasn't having it. I appreciate the book recommendation, I'll be sure to keep it in the back of my mind if it ever comes up with friends/family/coworkers/whatever.