don't tell her and don't get caught, I mean really is it that important that she needs to know? or wouldn't it be easier for you to just lie, and not get caught. Its a bitch sneaking around, I know, but you got to look it from the viewpoint that you told her now and took the leap, it backfired, and ure mom is just from that wave of thought, over time she might change her mind, but at the moment she believes in the government propoganda, that is enstilled in her mind since when she was young, change her mind by supplying her with the facts behind all the myths, but thats gonna take a lot of time on ure part to research, and in the end, som1 will only ever believe something in the end if they really want too, and your mom sounds like one of those people who don't want to. The morally right thing to do is stand your ground, cuz weed is just a plant, you can't fuckin believe ppl are so moronic to threaten you for it, then turn around and say its good for you because at the end of the day you're 'harming' ureself, irreparably, even if you can't see it. But in reality, no matter what you know you gotta look at whats really gonna happen, she gonna call the school, which is gonna bring a hole load of shit in to ure life both at home, and then school (can u imagine if ure school calls police?), and then that goes on for the next 1.5 years, and ure gonna be frequently drug tested for which you defineatly can't smoke weed, every fucking slip in ure academic lifestyle will be attributed to that, and yes you are morally right, but what good does it come to?