Marking Ohio's first legal 420 holiday

COLUMBUS, Ohio (WCMH) -- Sunday marks the first "420" since recreational marijuana sales were made legal in Ohio. 

The origins of 420 – an unofficial marijuana holiday observed on April 20 – are unknown. Some say it was first used in the 1970s by a group of students as the time of day they would get together and smoke; others say it comes from police code of marijuana possession; still others say it comes from hippie culture and spread among fans of the band The Grateful Dead. 

List...