What are mental effects of cannabis / marujauna / weed ?

See below: Cognitive impairment, reduced testosterone levels, cancer and heart disease risk. Depression and anxiety with any reduction in use lasting weeks into abstinence. Oh, and physical withdrawal.

Many: Really know what you are getting. Here are some of the possible effects from marijuana use: feelings of anxiety, depression, fear, panic or in some cases euphoria. If a high dose is taken it can lead to delusions, hallucinations or losing touch with reality. I suspect that you may be experiencing derealization (a mental state in which the world around you seems unreal, different or surreal) or >.