I have been smoking pot since I was 13 years old. I am now 23 and have cut down on the weed a lot. I also did a lot of coke and became a daily drinker since the age of 20. I noticed that if I stop drinking and doing coke for a while and only smoke weed, I get the worse panic attacks, even if I only take a few hits off a bowl. My symptoms include loss of breath, rapid heart beat, feeling disoriented, shaking, and just an overall worry of dying. It sucks because all my friends smoke (A LOT) and I used to love smoking. So I guess this is a normal thing for some people. Now if I feel a panic attack comming on I simply take a xanax or try to stay somewhat active and not think about it. This seems to help out a lot.