So did a lot of the people that pushed through Prohibition. It became plain though that the damage caused by Prohibition was worse than the effects of the substance. It made criminal enterprises very profitable, and those profits led to violence on the part of criminals fighting to keep their piece of the action as well as corruption of employees at all levels of government. It also led many people to distrust the government, even to the point of considering it the enemy. Sure, you can stop people from engaging in certain behaviors by holding a gun to their heads, but they generally resent that. I see the same thing happening now with the drug war.
The fact is, there is a fairly high percentage of the population that has used marijuana at some point in their lives, and those that I know seem about as normal as anyone else. Sure there are some oddballs, but they'd be oddballs even if they had never used it.