I won't comment on the health issues since everybody already did that in depth. Another thing to consider is the social aspects. Smokers tend to like to hang out with other smokers as non-smokers do the same with non-smokers. Non-smokers don't want to smell smoke while smokers don't want to be antagonized by non-smokers.
This issue is extremely important in relationships. It is very challenging to make a relationship work in the long run if one is a smoker while the other is a non-smoker (and hates smoke).
So you may also want to consider your present and future social circles as well. Hope you make the right decisions.