I smoked 2 packs a day for 35 years. I started using a e- cigarette 3 years ago & have not picked up a cigarette since. I started at 32 nicotine level & now do no nicotine. I vape a mod now & my breathing is better & I don’t smell like a dirty ashtray. I have gotten my husband ,son, & landlord to quit too, now that is what I call awesome !!!!😄