I couldn't tell you how toxic it's going to be. I can tell you that it can't be good for you at all. I can tell you that 7 grams is a LOT of crystal and at my tolerance, that would last me more than 2 weeks if I was just slamming it. If it's good shard, you'll prolly need only .1 to .2 of a gram in a shot. If you need anymore than that, then it's got to be poor quality or you have a high tolerance. In the case of the former I wouldn't even touch it not to mention inject it considered its prolly got some nasty chemical by products. I can tell you that prolonged use will lead to poor nutrition and sleep deprivation. Your in for one hell of time with 7 grams of meth. If your even somewhat like me, your best bet is to stock up on benzo's like klonopin's or xanax and some heroin or other opiates because your gonna need some downers to keep you from going completely insane off the walls tweaking.