Stimulant drugs including amphetamines and methamphetamine was a factor in 93,562 emergency room visits in 2009.
Over 20 percent of high school seniors reported using marijuana in the past 30 days in 2010, while 19.2 percent smoked cigarettes.
School kids in the UK as young as eight years old drink alcohol, causing difficulties in maintaining the concentration levels in the classrooms due to hangovers.
Methadone addiction may cause dry mouth which can lead to tooth decay.