Last week marked the fifth anniversary of Colorado's decision to sanction the world's first anything-goes commercial pot trade.

Five years later, we remain an embarrassing cautionary tale.

Visitors to Colorado remark about a new agricultural smell, the wafting odor of pot as they drive near warehouse grow operations along Denver freeways. Residential neighborhoods throughout Colorado Springs reek of marijuana, as producers fill rental homes with plants.

Five years of retail pot coincide with five years of a homelessness growth rate that ranks among the highest rates in the country. Directors of homeless shelters, and people who live on the streets, tell us homeless substance abusers migrate here for easy access to pot.