Smoked for 40+ years and was going through 3 packs a day when I started to vape. It's illegal here so vape shops only cater for cloud chasers with mods, RDA's and 0mg liquid. Have a few batteries and even more tanks. Even with nicotine liquid, none of them could take away the craving for a cigarette.
To cut a long story short, I needed specific criteria for an ecig. Such as handling, draw, nicotine strength, throat hit and no f*****g button to push. Make it as close as possible to smoking a real cigarette. After 6 months trial, error, searching and wasting money, found Halo G6 cig-a-likes (good quality, re-branded KR808D0-1 devices). Haven't needed to smoke since.
My primary issue with automatic KR808D-1 batteries is the draw, no resistance, like sucking air through a hollow tube. Used a tiny ball of Blu-tack to block one of the air holes in the battery, Perfect!
Been a year since my last cigarette. Can't say I've quit smoking, just exchanged it for vaping. If I wasn't vaping I'd be smoking. That said, today I can breath, not go into coughing fits when I try to talk, have energy and can even smell stuff!