The following are causes of substance abuse:
Drug abuse can be genetic. Having parents who abuse drugs put a young person at risk of the same behaviour. It is possible for that young person to grow up without drug abuse issues.
Continually chasing the high that a drug may initially give leads to people being hooked.
Use of drugs by peers influences individuals to try them. Peer pressure can be a tremendous force in getting individuals to try things they normally would not do on their own.
People suffering from anxiety, depression and other mental illness may use drugs to ease suffering.
Boredom in teenagers and young people is a big factor in drug abuse. The drug world seems to be exciting and allows one to escape the mundane.
People think drugs will relieve stress.
Overuse of prescription medication can lead to mixing drugs, overdose and unexpected side effects.