Smokers regard this phenomenon as communication. People you know or don't know will ask: Do you have a cigarette? People who have cigarettes offer them to strangers and then strike up a conversation. He not only smokes yours, but you can also smoke his. If you ask a stranger who smokes at the meeting, do you have a cigarette, big brother, have one? Someone else will give someone who doesn't ask who you are. Then they will talk.