PCP users may experience may experience behavioral disturbances and acts of self-injury including suicide, and attacks on others or destruction of property.
There are many known cases of individuals dying following consumption of magic mushrooms.
THC levels in hashish can vary from almost none to 70%, and hash oil from 30-90%.
The concentration levels in many forms of GHB can vary greatly, making it nearly impossible for an user to know what dose they are actually consuming.