[trimethylpurine]

Counter example, many people only want to get high on any other drug when they consume alcohol, which isn't sold by drug dealers.

We need to be careful with logic problems like, "Most users of harder drugs indicate past use of marijuana."

All users of all drugs report drinking water in the last 12 weeks.

These kinds of statements don't mean anything, but they sound important to the average reader.

Correlation != Causation