David, a 15-Year-Old Boy, Smokes Marijuana on a Daily Basis

Multiple Choice

David, a 15-year-old boy, smokes marijuana on a daily basis. He thinks that it helps him to talk to friends. Most of his peer group smokes marijuana. What can we predict will happen when David is in his 20s?

A) David will become a heavy drinker with potential alcoholism in his 20s.
B) David will continue using marijuana at the same rate in his 20s as he does in his teens.
C) David will most likely increase to daily use and dependence on marijuana in his 20s.
D) David will most likely quit because he mainly uses it for conformity, and that isn't important in the 20s.