Types of addiction

Approximately 16% of the U.S. population ages 12 and over has a substance problem. This includes:
Nicotine (approximately 9%)
Alcohol (approximately 7%)
Illegal drugs (approximately 2%)
Prescription drugs (approximately 1%)
Note: The percentage of the population with each type substance problem adds to more than 16% because some people have more than one type.
Over half of those with a substance problem also use or have problems with another substance.
Among people with a substance problem, nearly 1 in 5 have multiple substance disorders.
Nicotine: over 1/5 have another alcohol or drug problem
Alcohol: nearly 1/3 also have a nicotine or other drug problem