What do you think about me throwing my friend's cigarette in the bin when he offered it to me when he knew my virulent anti-smoking stance
Why do you want to do this with your friend's cigarette?
Why the Hell would I take a cigarette from a friend of mine?
You should not throw away the cigarette, just don't take it in the first place. You shouldn't accept a cigarette from a friend if you do not smoke.
I just took it for a second for the photo.
Knowing that you don't smoke, you shouldn't take a cigarette from a friend. However, if you simply let him know that you do not want the cigarette, he will likely take it back.