Heathrow Director and M.Mouse have hit the nail firmly on the head with the "stink" issue. I gave up twenty years ago when our kids were very young and I realised at last how bad it is for your health and I wanted to be around to see them grow up.
But it wasn`t until I stopped that I realised how anti-social it really is. I hadn`t really smelt a smoker before and I found being in their presence quite disgusting. I like a drink as much as anybody but rarely go into pubs these days because of the smoky smell both in the premises and the following morning in my clothes.
So Mango if for no other reason than avoiding being a pariah among your non-smoking friends give it up.
Best of luck.