Evaluate and discuss the negative impact of the four chosen youth risk behaviours

Here are my chosen youth risk behaviors:
- Smoking, increase my risk of developing lung cancer and impotency
- Focussing on my hobbies rather than listening to teacher in class, even though it may be a right path, i may miss several important knowledge that i need in the future
- Sexual activities, could lead to early pregnancy and destroys futures
- Alcohol drinking, could lead to liver damage and accidents