Advice

My parents smoke pot. I am 15 now and found out when I was 13. They think I am oblivious to life or something because they try to hide it from me, but I've known for a while. In May, my grandparents found out about them smoking pot. They found out that I hardly ever talked to them because they stayed in their bedroom a majority of the time, and when they came out their eyes were always red, they were always having coughing fits, and always acting so slow. They were not sleeping at night and losing a ton of weight and not eating as much as normal. It drove me crazy. I would cry and cry and cry about it. I could never wash my own clothes because our laundry room was linked to their bedroom and I could never get to it because they would never let me in there. They always locked it. Once my grandparents tried to get custody of me, they quit. They just recently started again and I can't deal with it. It's driving me crazy and I don't know what to do or who to talk to about it. They still think I don't know and am an idiot, but of course I know. I don't know if I should tell my grandparents because I know it will just cause problems. I can't stand hearing my parents coughing because they are smoking pot. I can always hear them when they do it and I can't help but cry. The fact that they started again after I already almost got taken, makes me think that they don't care whether or not I'm here or not. They could care less about me and I don't know what to do. I can't stay here with them doing this. I feel like they don't care about me at all. What do I do?