In one study, adolescents who smoked cigarettes were about twice ...

[kodithompson]

In one study, adolescents who smoked cigarettes were about twice as likely as nonsmokers to later use marijuana. For this reason, cigarettes have been referred to as
 
  A. addicting.
  B. a gateway substance.
  C. toxic.
  D. a correlate.

Question 2

An example of a longitudinal study of drug use would be
 
  A. surveying high-school seniors every year.
  B. following each individual throughout the entire day.
  C. sampling drug use from different parts of the country.
  D. following the same group of people at intervals over several months or years.

[atrochim]

Answer to Question 1

B

Answer to Question 2

D