Man, I loved my coke years. Those were some fun, crazy times. I hadn't done it in a decade, then I met a buddy who sold it about 3 years ago, and started doing it again once a week up until last year. He would share the good shit before he cut it. Shit was unreal, I'd get excited just to hear he was coming over, and that wasn't for his company. I agree, cigarettes are almost impossible to quit unless the doc just informed you that you have cancer. Have you ever read Stephen King's Quitters Inc.? Awesome read, and VERY chilling short story. I highly recommend it, here's a link to a free PDF -
mrfitton.weebly.com/uploads/1/7/5/8/17583739/quitters_inc._text.pdf