You might be smoking something which is laced with chemicals or other drugs. That could cause the muscle spasms and sikness. When you smelt it and felt sick is a pyscholoigical accociation between when you were sick from cannabis and how you blamed that sickness on the cannabis. So therefore when you smell cannabis you may automatically feel ill. I have the same thing with vodka, drank too much one night and was real sick, never drunk it again because the taste makes me feel sick. You might just have low tolerance or be smoking the wrong kind of strain for you but if you keep getting sick and having muscle spasms i think you should just quit.