Research on the Use of Addictive Drugs Indicates That

Multiple Choice

Research on the use of addictive drugs indicates that

A) less than one-third of Americans who have ever smoked cigarettes have ever quit.
B) regular marijuana smokers typically need to take progressively larger doses to feel the same effect.
C) many people do voluntarily stop using addictive drugs without any treatment.
D) the majority of people who try cocaine become addicted within 10 years of first use.