Featured image: 7,000-year-old skeleton of woman may have been a victim of leukemia, making it the oldest case found.
Story highlights. Colorado began allowing the sale of recreational marijuana on January 1 to anyone age 21 or older. Residents can now buy marijuana like alcohol -- except the cannabis purchase is limited to an ounce, which is substantial enough to cost about $200 or more.
Related stories. 1  Colorado Springs head shops accused of illegal marijuana sales; 13 indicted. â 2 Major milestoneâ: Colorado hits half a billion in cannabis tax revenue. 3  Massachusetts marijuana tax rises to 20 percent in lawmakersâ new deal. 4  Monthly marijuana sales of $100 million the ânew normâ in Colorado.