A better analogy is the gun laws mentioned above. Hell it even works as an inversion in this case as Colorado has tougher gun laws than all the states in question.
An even better analogy is fireworks. States with legal fireworks sales typically have big stores right across the line from states where sales and possession are illegal. Furthermore, like marijuana, transporting fireworks across state lines without a license is a federal offense. However, given the long history of fireworks use, especially around the 4th of July, there's often some level of detente.
Consider IL and IN. IL is quite strict about fireworks possession and use. IN permits sales to persons over 18 so there are stores right across the border from IL. It's highly unlikely that an IL sheriffs deputy would stop a car coming from IN on suspicion of possession of fireworks. On some rare case that there was a stop for other reasons they might write up a misdemeanor ticket, but more likely would inform the driver that the fireworks were illegal in IL and they should dispose of them promptly, which could include surrendering them to the officer. In cities in IL, enforcement for use on a holiday is usually lightly enforced and is reserved for large displays that pose a significant fire or safety risk. OTOH sales of fireworks in IL is taken seriously and an offender can expect legal consequences.
It wouldn't surprise me to see local law enforcement begin treat marijuana in the same way. Tough on secondary sales, but light on transportation.
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