15-20% is an incredibly wide range, and far beyond the success rate for any other method. I’ve only seen 100% success rate from the 22 people I’ve gotten off cigarettes with vaporizers. I don’t even try with those things that look like cigarettes.
Well, the 15-20% were people who were able to vape - for 30 days!
All the others went back to smoking after about 30 days.