Reefer madness or pot paradise? The surprising legacy of Colorado

A marijuana plant grows under artificial light at an indoor facility in Portland, Maine. Maine Gov. Janet Mills signed a bill Thursday setting up a legal framework for the sale of recreational marijuana to adults as early as next year. (AP Photo/Robert F. Bukaty, File)

DENVER — Serenity Christensen, 14, is too young to set foot in one of Colorado’s many marijuana shops, but she was able to spot a business opportunity in legal weed. She is a Girl Scout, and this year, she and her mother decided to sell their cookies outside a dispensary. “Good business,” Serenity said.