And that's where I think a well-thought-through policy of incentivizing the new while recognizing that there's going to be a transition process -- and we're not just suddenly putting the old out of business right away -- that has to be something that both Republicans and Democrats should be able to embrace.

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On legalization beyond medical use, we may be some years away, or we may find that we suddenly reach a tipping point, much like the end of alcohol prohibition in the last century.

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"If you've been paying your mortgage for 20 years and deferring a lot of pleasure for later, to have that suddenly taken away, well, that can be hard on people, " says Jonathan Rich, Ph.

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