America's 40-year crawl toward legalization of marijuana is picking up speed. Twenty-six states have taken steps toward legalization, some quite bold. Just last week, Colorado Gov. John Hickenlooper made one of the biggest moves yet, signing a package of bills addressing how marijuana will be grown, sold, taxed, and used. The measures, which follow Colorado voters' approval of legalization last fall, form the cornerstone of the nation's first fully legal market for pot. Come Jan. 1, Colorado residents over 21 will be allowed to buy marijuana at retail stores and smoke it for their pleasure. The...