Comparing Adolescents Who Smoke Cigarettes with Those Who Do Not

Multiple Choice

Comparing adolescents who smoke cigarettes with those who do not, and then looking at later adoption of marijuana use, cigarette smokers are about twice as likely as non-smokers to later use marijuana. For this reason, what have cigarettes been referred to as?

A) Addictive
B) A gateway substance
C) A conduit
D) A correlate