I might show her this video (linked below) and then have "the talk" with her. (she loves drew carey and I bet she has no idea he probably smokes refer)

reason.tv - Videos > Medical Marijuana

I'll let her know I love her, but I've decided that the drug laws in this country need to be changed and I'm going to fight to do it. I'll tell her I want to try marijuana for the same reason I initially tried beer.

I'm so nervous just even imagining doing this... but I think this is what I need to do.