I started using that three weeks ago and the first day I had no cravings, no nothing. What I felt was a burning sensation in my stomach (actually, more like a heat sensation, a flush, than burning), and I didn't sleep very well. Pretty much the same thing the second day, with some occasional cravings. After three days, no burning, but I was craving more often for a cigarette. I resisted somehow, I finished steps 1 and 2 without smoking. I couldn't finish the step no. 3 because I was having pretty bad stomach cramps and I was bloated as a balloon I think it was the combination of pills and a diet tea I was drinking). I still use the spray from time to time. I have cravings, but I can control them most of the time. Yesterday I was very upset and I smoked a half of cigarette. If you ask me, I can't swear the product really works. It might be just placebo and my willpower (I quit for seven years before that), but it helps to boost your confidence that you can get rid of cigarettes. And I really believe detoxing your body instead of using nicotine (patches, gum and so forth) or psych meds to replace nicotine is the right way to quit.