what are those serious problems and what are their cause and effect?
To answer your query, without question, drinking and drug taking is a serious problem not just for teenagers but for adults as well. Anyone can get addicted to intoxication and it can become too late before realizing that he has a serious drug and alcohol abuse problem already.
Some serious problems that one might encounter when drinking excessively are health, monetary, and relationship troubles. Anyone can become really hooked-up with drinking that he can make illogical decisions that won’t just hurt himself but the people he care for as well. For additional info about serious problems for teenagers who take drugs and alcohol, read the articles in the links below.
Teenage Drug And Alcohol Abuse Problems
Teen Alcohol and Drug Abuse-Topic Overview – WebMD
One needs to have a bird’s eye view perspective of the problems that a teenager might experience if he has substance abuse problems. It’s a good article that should be read and shared.
High School and Youth Trends – National Institute on Drug Abuse
The parents, relatives, friends, and the teachers of a student who’s abusing himself from drugs and alcohol should understand the problems of the teen. They should ask questions and should make the teenager feel that there’s a solution to the problem that he’s having because otherwise, the abuser can kill or be killed through his intoxicating habits. Learn more about drug and alcohol abuse facts via this write-up.

Adolescents, Alcohol, and Substance Abuse: Reaching Teens through Brief …
This is an e-book that has full of resources with topics such as teenage drug and alcohol statistics, teenage drug addiction, and warning signs of drug abuse. You can read this on your tablet or mobile phone.
You can also read these other teen drug and alcohol abuse articles from Drug Abuse and Drug Free.
Teenagers Should Become More Aware of the Problems That They Might Face Because of Drug and Alcohol Abuse.