smoked 20 years have not had 1 in the 8 months of vaping

I smoked over 20 years a pack a day or more. I started vaping 8 months ago and have not had 1 since the first week I started. I started at 24mg nic and now use 6mg of nic with the occasion 12mg thrown in there. I feel so much better then I did months ago. I have gotten my long heavy smoker friend to start vaping and he is at 2 months with a cigarette here and there I think he has had 4 or so since he started.