It took me around 5 days to go from a pack and a half a day to 0. Funny thing was, I never intended to quit. I tried vaping to appease my mother. Her mother smoked most of her life and recently died of lung cancer, so my mother picked up starter kits for all the smokers in the family. I felt I had to promise to try vaping, but I made no promises regarding quitting smoking. Ended up that I am one of those people who develop a strong distaste for cigarettes after vaping for a while. I couldn't finish my last cigarette. It tasted like burning tires in a dump. Even more amazing was that I was able to vape through cravings while my husband smoked cigarettes in front of me. He was so impressed, he quit via vaping as well. He never developed the distaste for them, and he isn't as "into" all things vape as I am. I suspect he only vapes because he felt guilty smoking after I quit. He can still appreciate a good set up though, and I think I've finally gotten him to the point where he kind of enjoys it with a Provari topper with an eXpromizer.