Strangely enough (smoked 2 packs a day for many years), I never went back or craved any the moment I had a good vaping solution. Kept a pack (unopened) on stand by for emergencies, but they never arose. I chose to run at 24 mg up front, assuming it would work, and it did. I think after the first few days however, I kept reaching for a pack of smokes, reaching for a lighter. It seemed the nic in the juice took care of the physical issues, but it took a while to break the repetitive smoking motions (if that makes sense).