I know of a young guy who smoked grass a few times, not more than 5 times. Since then he has been suffering from anxiety attacks and has even had to see a psychologist. I never heard of this happening in my day. I also know that they use it in the treatment of PTSD to keep people calm. I find this reaction strange, especially considering that this person has not smoked very much. I know you can become paranoid while you are high, but it wears off. Have you ever hear of such a reaction?