DUDE same thing happens to me when i smoke mj... ALL the time, i tried alone, with friends, always the same thing. All my body muscles are twiching very fast, it stresses me, and the more im stressed, it twiches even more.

I think that at the same time you are smoking, you are having a panic attack... U can check out the symptoms, its when ur body produces adrenalin for nothing, and u get really scared for nothing...

It did it to me 3 times, it seems that since i got scared the first time, my body is used to getting scared when i smoke mj, so all the time, i get that same feeling. Sometimes my muscles are so tense, all my body starts shaking...

Anyways, dunno what to do about that..