Final answer:
The primary factor in the development of young people's attitude toward drugs is family influence.
Step-by-step explanation:
The primary factor in the development of young people's attitude toward drugs is family influence. Research has shown that parents and other caring adults in a young person's life have the greatest influence on their behavior, including their attitudes towards drugs. If parents raise their children with a negative view towards drugs, the children are more likely to adopt that viewpoint. On the other hand, if parents use drugs or have a permissive attitude towards drugs, the children are more likely to have a positive or neutral attitude towards drugs.