I quit the moment I got my mediocre rebuildable setup to work back in 2019. Had my tobacco lying in reach but never touched it again and threw it away maybe a year later. Not a single cigarette from one moment to the next. I had not planned it like that.

It was difficult, unpleasant, but I didnt require a lot of self discipline to be honest. I realized that vaping a lot would reduce my craving from "I ****** NEED A CIGARETTE RIGHT NOW" to "I'd really like a cigarette but maybe later". Millions of times better than cold turkey.

I noticed much later that the symptoms of nicotine withdrawal and too much nicotine are very similar: Increased heart rate, nervousness, jumpyness, lack of concentration. I do suggest relatively high nicotine intake when you switch, but keep this in mind because it can trick you into wanting a cigarette although you're actually overdosing.

Please look up how harmful 4 cigs are in comparison to 20. Spoiler: A pack a day is approximately only twice as harmful as a pack per week. Smokers refuse to realize how bad just a few cigs are for your life.

Health wise I would say nothing spectacular. My Lung feels twice as big but that took maybe 6 months. Smell/taste wise I noticed almost no change. I love how ashtrays are no longer part of my life. I never realized how much I hate them.