I'm 20yrs old. I've been smoke marijuana for 5 yrs. About a yr ago I was smoking it when my face started feeling really hot. A minute or two later my heart started pounding really hard and super fast. I mean it was pounding so hard you could see it and I literaly thought it was going to burst. About 20 minutes later while my heart continued to pound and race, I started to shake really bad and I was clenching my jaw not on purpose. After another 30 minutes or so it stoped after I had been laying down and trying to take slow deep breaths. After all that I was super tierd. Are these panic attacks or anxiety attacks? And is it cause from smoking marijuana? After that first attack it happend again about twice a week for a few months and stoped till here recently. They always happen after I smoke weed except for one or twice when I was watching a scary movie.