May cause anxiety and paranoid states
Popularly referred to as "anxiety" and "paranoia", these are conditions most marijuana users have experienced. They are associated with an unjustified fear of an imaginary or difficult to define threat. They can appear with varying frequency and intensity. Research shows that the psychoactive component of THC is responsible for the sensations of anxiety and paranoid states in "ganja" smokers. A group of scientists from the University of Oxford tested 121 people between the ages of 21 and 50. All of them were sane and had at least one-time experience with marijuana. The volunteers were administered an intravenous dose of THC corresponding to the dose contained in the strong join. It found that half of the participants given THC experienced anxiety. In the placebo group, the percentage was 30%.