when a person drinks, thats his personal life, as he is ruining only his own health...but when a person smokes, he is ruining others health too...there is a rise in passive smokers, getting health risk...these are those people who dont smoke themselves but are in company of smokers...which is mostly spouse and family...
so for the family and beloved's sake...a person should try to kick the butt.
So whether Karan wants to become next SRK or not...both him and SRK should try to quit smoking...