How does drugs cause ill health,accidents,crises or disasters

Answer 1

I think your wording is backwards. Is this what you mean?

How do drugs cause ... ?
or
What are the effects of drugs on ... ?

You'll be doing LOTS of research because there are tons of information out there.

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If you need help learning how to search, including how to choose good search terms, go here and scroll down to the links under HOW TO SEARCH THE INTERNET:
http://hanlib.sou.edu/searchtools/

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Also ... do you have access to a college or public library? Even if you go to the library only once to get a library card/number, you should be able to get the usernames and passwords so you can access the huge databases most libraries subscribe to these days. You'll often find better information through them than through general searches on the Internet.

Here is an example -- one college's library website (but public libraries usually have many of these, too): (Broken Link Removed)
Click on Electronic Resources/Databases to see the different databases this particular college provides for its students. EBSCOhost, ProQuest, and Facts.com are among the largest and best.

What does your library provide? That's a good place to research.