I was a smoker for many years and the sociability is a huge factor that doesn't get much attention, and is the only thing I miss about it.
The relationships I established with fellow smokers, whether it was at work while stepping out from the office, standing outside a pub, stepping outside on a balcony at a party, etc. were almost always stronger than with my non-smoking friends. You immediately become part of a social circle with people you at least have one thing in common with, and are standing around with a limited number of minutes to chat about almost anything.
I haven't had a cigarette for nearly five years and the thought of lighting one up disgusts me, but I miss the carefree banter during smoke breaks with other smokers.