Alcohol Detox programs are for Alcoholics. It is the abrupt end
of alcohol consumption along with the substitution of
cross-tolerant drugs that have similar effects to the effects of
alcohol. This is the prevent Alcohol Withdrawal.
alcohol and drugs can have different effects on people depending
on the person and what kind (stimulants, depressants, etc)
Some alcohol and drugs can increase aggression in users and may
contribute to parent abuse.
That's far too broad a question. Some teens are uneffected by
drugs and alcohol, others may develop an addiction. The effects
differ from teen to teen. But the rate of addiction is high for
those who start using drugs or alcohol younger.