This is basic supply and demand. Supply side enforcement for drugs is unlikely to be successful. Increasing the enforcement only raises the reward for doing it

This is basic supply and demand. Supply side enforcement for drugs is unlikely to be successful. Increasing the enforcement only raises the reward for doing it eventually as the market dictates someone will step in to fill the role as long as supply demands it. On the other hand the reality is that there is a limited supply of drug users. Demand side enforcement could end the "war" quickly. Enforcement of sellers is dumb, people selling drugs isn't the problem. It's their usage that's what we want to stop so the enforcement should be on that side.