What I want to know.

My topic consists of many affecting drugs and what they do. I would like to know which drug has the most negative affect on people? I believe if I have this information I can really narrow my focuses down and become a big influence on preventing this issue. Furthermore, I would like to know what is the main cause or causes behind drug abuse, and how can we stop it? If I could learn about the causes of drug abuse, then I can have some background information on my topic and would be able to strengthen my abilities in stopping it. Lastly, but not least, I want to know what are the reasons people do drugs, should they be allowed to do them if a parent, why do they mainly do it, and how many kids are affected by this today? Knowing this information will really inform me on my topic and make me more of an influence in stopping parental drug abuse.