"I have never used drugs or been around anyone who did."
I don't think you are lying, but I will call you very naive. I attended a Christian High school and started at a christian college. I knew more people that used drugs in those settings than I did in the public schools I attend. In addition, I know several regular church goers that use drugs today.
The amount of drug use in our society would probably be very shocking to you.
I attended Bob Jones University. There was no drug use going on anywhere near me.