Smoking was once thought of as glam and sexy, but not any more. We're becoming less and less accepting of smoking, more and more people are giving up, and people are becoming more and more concerned about the dangers of passive smoking (though we do still underestimate these dangers).
Your decision to give up will be appreciated and accepted by your friends and the people around you. Nowadays people know the damage smoking does not just to smokers but to the people around them, and they'e not afraid to voice their concerns. They'll understand you're giving up for the sake of your health, and they'll support you. And now that smoking is banned in public places, there's no excuse. There's simply never been a better time to stop!