There’s a first time for everything, I thought as I rolled into a Gas & Grass south of Colorado’s state capital, pulling up next to a pump.

The station was pricey: Fuel cost at least 15 cents or more a gallon than at neighboring establishments, but this place combined the features of a traditional gas station with a marijuana dispensary,

“Why is it so expensive?” I asked an employee who was checking a nearby pump.

She replied, “You get a 5-cent discount per gallon if you buy weed too.”

Welcome to the entrepreneurial world of Colorado’s green rush, the billion-dollar-a-year industry that has emerged since the state began permitting the sale of marijuana to adult recreational users two and a half years ago.

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