The top Ecstasy side-effects reported are difficulty concentrating, jaw clenching, grinding of the teeth during sleep, lack of appetite, and dry mouth/thirst.
Research among college youth indicates that hashish use tends to result in more deviant and delinquent behavior, aggression, and greater rebelliousness.
Psychological addiction on alcohol may occur with regular use of even relatively moderate daily amounts. It may also occur in people who consume alcohol only under certain conditions, such as before and during social occasions.
It has been proven that drug rehab reduces costs associated with health and social costs of addiction, by far more than the cost of the treatment itself.