Alcohol/Drug/Substance Abuse

Alcohol Abuse 
NIAAA is constantly researching answers to questions about alcohol.
https://www.niaaa.nih.gov/overview-alcohol-consumption

Alcohol Use Disorder (AUD) can range from mild to severe, depending on the symptoms.
https://medlineplus.gov/alcoholusedisorderaud.html

Drug/Substance Abuse
Repeated drug use can lead to brain changes that challenge an addicted person’s self-control and interfere with their ability to resist intense urges to take drugs.
https://www.drugabuse.gov/publications/drugfacts/understanding-drug-use-addiction