I think its envy, too.
As well as jealousy.
They can't stand the fact that you had the power over yourself to put the stinks down.
I'm not one of those reformed smokers that get on people who chose to continue smoking.
However, I will say something snarky to them if I have to, if they can't respect my decision...my will power...to quit.
They can all eat a plate of poo.
lol