The immediate effects depend on the quantity used, the size, mood and tolerance level of the user as well as their personal metabolism. The effects are not necessarily predictable as individuals can react differently. Some users of cannabis report no reaction. Most frequently users report feeling relaxed with lowered inhibitions and enhanced sensory perceptions. Users often become giggly and hungry.
Physical effects can include reddened eyes, dizziness, impaired coordination and balance.
The intoxicating effect of cannabis resembles that of alcohol. Although the psychoactive effects wear off within hours, THC is stored in body fat and can be identified in body products and tissues several weeks after use. Negative effects include nausea, headaches, fainting, mental confusion. In the stronger forms like hashish and resin, cannabis can lead to hallucinations. When cannabis is combined with other drugs, such as alcohol, the effects can be greater than when one drug is taken by itself.