Well doctor, i didn't want it to come to this. But I'm 22 I've smoked weed for years, lots at a time and could never get too high. Recently my tolerance dropped tremendously. Within a few minutes of only taking ONE hit I start to feel like my heart is well over 120 bpm and I start sweating. I can't talk, I can't lay down, I can't walk. It's like I'm going to die or something. I've done it a few times to see if it wouldn't happen again..but it does. It's far worse than an anxiety attack. I just don't see how I could smoke a lot at a time and be able to do anything (run, play basketball, take tests) all just fine. And now one little hit literally puts my in a concious coma..whats happened to me?