| Marijuana | Drinking | |
| % of parents that believe their teen engages in... | 5 | 10 |
| % of teens that actually engage in... | 28 | 52 |
Sources:
, mottnpch.org

| Marijuana | Drinking | |
| % of parents that believe their teen engages in... | 5 | 10 |
| % of teens that actually engage in... | 28 | 52 |
Most parents believe that their high school age teens do not drink alcohol or use marijuana. However, the reality is that a huge number of these teens engage in these illegal activities without their parents knowledge.