Sources

http://www.drugabuse.gov/publications/addiction-science/why-do-people-abuse-drugs/why-would-anyone-abuse-drugs

http://pbskids.org/itsmylife/body/alcohol/article6.html

http://www.niaaa.nih.gov/alcohol-health/overview-alcohol-consumption/alcohol-facts-and-statistics

http://www.drugabuse.gov/drugs-abuse/alcohol

http://www.drugabuse.gov/publications/drugfacts/cocaine