What types of risk behaviour is there among teenagers?

Teenagers are at a very risky time of life - their brains are just mature enough to make them think that they're smarter than they really are, when in fact, the brain does not fully mature until you are in your 20's. This makes teenagers do some really stupid things like the following:

• Thinking that nothing bad is going to happen to them and not being careful about things like sex or drugs or dangerous behavior
• Thinking that they're smarter than everyone else and taking chances that more mature people don't take due to the dangers
• Thinking that normal probability and consequences don't apply to them

Some specific risk behavior includes taking drugs (both illegal and other people's medications), drinking recklessly, having unprotected sex, driving recklessly, texting and driving, drinking or doing drugs and driving, cheating and breaking laws and rules of all sorts.