Most of brett's friends are on his football team. they avoid marijuana so they can stay fit and healthy for their sport. his family has also decided to avoid addictive substances because there is a history of addiction within the family. brett is a big fan of a football star who speaks to young athletes and encourages them to avoid harmful substances. which of these would be most likely to negatively influence brett toward marijuana addiction? a. role models b. peers c. family d. heredity