Worse, these users may react unpleasantly and become extremely frightened. Effects on mood and emotion vary. Usually there is some euphoria. Sometimes, however, particularly in the inexperienced, mood may be unaffected or there may be dysphoria or anxiety.
More serious responses can also occur, in particular, panic reactions and psychoses.
Users of marijuana can smoke the same amount on one day as they did on another, and get a completely different experience. Euphoria is frequently followed by a period of drowsiness or sedation. The central neuropharmacology of psychotropic cannabinoids. Neurobiology of marijuana abuse. Characterization of the absorption phase of marijuana smoking.