Question

how many children(aged under 18) are taking drugs?

Answer 1

I doubt you'll find a definitive answer for this, but here are a couple of places where you can try to look for information:

http://www.fedstats.gov

http://www.ask.com
Type your QUESTION in the search box. You'll probably get a screen or two that ask you to clarify or narrow the focus of your question.

Answer 2

thank you very much , though what it fedstats? how do you use it?