For the majority of the people behind bars for use only, you have to ask, "is the punishment worse than the crime?" For it seems putting someone in prison for 10 years will destroy his life far worse than if he had used pot for the same time period on the outside.
Are you under the impression that we put pot users in prison for 10 years? Wow.
You would agree, wouldn't you, that putting a drug dealer in prison for ten years is far better than letting him destroy hundreds of lives by selling drugs?