Cannabis is a depressant drug Depressant drugs do not necessarily make you feel depressed. Rather, they slow down the central nervous system and the messages going to and from the brain to the body. Cannabis effects vary from person to person The effects of cannabis are different for each person. The effect can vary according to the mood or atmosphere in which it is taken. The immediate effect of cannabis lasts approximately two to three hours and can include: A sense of well-being Reduced concentration Decreased coordination Distorted perceptions of time, space and distance Increased heart rate Drowsiness Increased appetite Reddened eyes. Larger doses or stronger forms of cannabis can make these effects stronger and add other effects like: Confusion Restlessness Feelings of excitement Hallucinations Anxiety or panic Detachment from reality Paranoia Nausea. http://www.betterhealth.vic.gov.au/BHCV2/bhcarticles.nsf/pages/Cannabis_marijuana?OpenDocument