According to the UNODC's World Drug Report, since 2006 illicit drug use in the global population has:

increased
decreased
remained stable

According to the US comorbidity survey, which drug was reported to have the highest percentage of users who become dependent?

Cannabis
Heroin
Alcohol
Tobacco

According to Kendler et. al. (2012) the risk of an individual developing drug dependence is higher if they have a drug using sibling of the opposite sex compared to a sibling of the same sex. True or false?

True
False

Research evidence suggests that entry into drug use is predicted by:

How much one likes a drug the first time they use it
Early age of onset
Positive drug expectancies
All three of these factors predict onset of drug use

Typically speaking, most drug users quit taking drugs

by attending self-help groups
without formal treatment
by checking into detox
by going to a rehab clinic