I completely agree. My example wasn't exactly the best, but relatively applicable to the US nevertheless.

You raise many good points about drug use being different geographically and culturally. It's very much about availability, local drug culture, etc.

For example, the speed paste. As you said, in the UK and in other European countries amphetamine is usually amphetamine in paste form, not crystal methylamphetamine like we usually see here in the states.

Culture and availability absolutely affects use massively, a point I didn't mean to gloss over, and one I'm glad you raised.