The flowering tops and dried leaves of the Indian hemp plant, containing the active ingredient THC (tetra-hydrocannabinol). The leaves are usually smoked but can be drunk as tea or eaten in food. Physical effects of marijuana include dry mouth, mild reddening of the eyes, slight clumsiness, and an increased appetite. The main subjective feelings are usually of calmness and wellbeing, but depression occurs occasionally. Large doses may cause panic, fear of death, and illusions. In rare cases, true psychosis occurs, with paranoid delusions, confusion, and other symptoms, which usually disappear within a few days. Regular use of marijuana may lead to a more permanent state of apathy and loss of concern (a condition that is known as amotivational syndrome).


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