參考范文：
　　In modern society, drugs are becoming a more and more serious problem in the world. The trade of drugs is widespread, which costs up to $800 billion every year.
　　As we all know, drugs do great harm to our health, not only causing people to die at an early age,but also directly contributing to the happening of crimes. As is shown on the chart above, 30% of the teenagers taking drugs are cheated into doing it, and 50% are driven by curiosity. Another 15% just seek excitements or try to get rid of their anxieties, and the rest try it for some other reasons.
　　In my opinion, in order to protect us students from drugs, we should be careful to make friends and stay away from those who always behave badly. Also, it's very important for us to lead a healthy lifestyle and hold positive attitudes towards life.