I have had severe side effects from smoking K2 and I'm trying to get my story out there as best I can for those who are considering it.

I started smoking it maybe a month ago.  I love smoking pot, which has never affected me negatively, but the opportunity for something legal was too good to pass up.  After a couple of weeks, I had a small incident which I wrote off as a "panic attack" -- a sudden increase in anxiety, followed by a cold feeling in my hands and feet, shivering (from the cold? maybe not?), and a loss of color in my face.

Yesterday I had a much worse experience of these same side effects.  I experienced muscle spasms all over my body, felt extremely cold, found it impossible to relax and control my breathing, and eventually experienced extreme anxiety that would be better described as "terror".  It took a couple of hours to pass, which constituted the worst drug experience of my life.  I will not touch the stuff again, because it is clearly dangerous for me.

I would buy and smoke legalized marijuana in a heartbeat.  But this stuff... it's something else altogether.