Im 22 and my mom took my bong.....lol?

First... Does your mom know you use marijuana for medicinal purposes? If not you should explain during your talk tonight why you do, and furthermore proceed with DOENTED evidence on the subject of marijuana not being addictive. But refrain from coming off as defensive...because that would verify her belief on your addiction and your "behavior". People who don't partake in marijuana usage and/or who are anti marijuana anti medicinal marijuana have a tend to have a closed mind. Don't over react. As a mother myself (of a young one) and someone who spent many years in a harmless haze during HS I still shudder to think of catching my child with marijuana when she is older, Regardless of all that I know surrounding it. It's the whole parental territory thing too. Be respectful, like the others said it is her house, and you are a guest.