Just ask people if they do or not. But don't act like anything is wrong if they decline. The important thing is not to give people the perception that you think it is a bad thing. It isn't atb all, so keeping it open will change a lot of people's ideas about it. You will be suprised how many people smoke nowdays. I have talked to older women in their 60-70s who have seen me buying High Times or books on cannabis in my shirt and tie haha. Most of them had the stereotype of it, but I at least gave them a different perspective on it. Some you will find even enjoy it today. lol Just bring it into conversation like you are talking about anything else.