Can't help with the stop smoking tips as I'm one of those that just happened to have awesome willpower and stopped cold turkey. But I do know the chances of quitting succesfully increase a lot with support and nicotine replacement (or buproprion) therapy. It's like 5% versus 23% success (in the short term). Again, it's just a statistic, and you may be in the 5% who can just plain stop.
WRT smoking and lung cancer risk and addiction, there have been some very interesting recent developments in this field. It started with a study that showed a strong association of a cluster of genes involved in nicotine signalling and the risk of nicotine dependence. Other groups quickly jumped on the band wagon (including our own) to try and replicate the study, and were successful for sure, but some other interesting stuff started popping up. For instance, to recruit enough heavy smokers for follow-up studies, some groups went to lung cancer clinics, and found sure enough that the gene cluster also associated with nicotine dependence, but also independently associated with lung cancer. In other words, folks who were non-smokers at the clinics also had an increased prevalence in this gene variation. Further studies definitely indicated that the gene was associated with both lung cancer AND risk of nicotine addiction. This is possibly explained by the fact that these nicotine receptors are found in high density in both the brain areas involved in addiction as well as in the surface of the lung. Kinda a double whammy because you are at increased risk of taking up smoking and also lung cancer.
I personally still think it possible that the genetic variation is a risk factor for schizophrenia (no one has looked at it yet), as the previous studies all point to a gene ‘dose effect’. In other words, the gene is even more common in people who smoke the highest number of cigarettes per day (30 or more!!), and for the most part really heavy smokers tend to be schizophrenic (90% of schizophrenics are heavy smokers). Time will tell…

