Originally Posted by http://www.erowid.org/plants/cannabis/cannabis_effects.shtml
The primary effects sought by those using cannabis recreationally are euphoria, relaxation, and changes in perception. Effects vary depending on dosage, with effects at low doses including a sense of well-being, mild enhancement of senses (smell, taste, hearing), subtle changes in thought and expression, talkativeness, giggling, increased appreciation of music, increased appetite, and mild closed-eye visuals. At higher doses, sense of time is altered, attention span and memory are frequently affected, and thought processes and mental perception may be significantly altered.