Syllogism:
- Drugs are bad.
- The best way to deal with bad things is by prohibiting them.
- Tougher criminal sanctions are more effective than weaker sanctions.
Therefore:
- The best and most effective way to deal with drugs is through tougher criminal sanctions.
Demolish.

Gallup Poll, U.S. marijuana smoking at record high, cigarettes at low: Gallup: Record High