So, for the first 12+ years of her life you're going to be a hypocrite? Is that the sort of example people want to set for their children? I know I see it all the time. Hell, it's not uncommon. And the legality of something doesn't always make it right (although marijuana being legalized in the next 16 years is something no one can be sure of).

You've got a job, a nice home, etc. but using illegal drugs and having large enough quantities can cost you those things and your child. Is it worth it for a few thrills? And have you consulted a physician and asked if it was okay? Please God don't go off heresay.