World ‘Stoned-age?’ People smoked weed 2,500 years ago, earliest use yet discovered June 12, 2019Doyle Rice, USA TODAYComments Off on ‘Stoned-age?’ People smoked weed 2,500 years ago, earliest use yet discovered Some 2,500 years ago, in present-day China, people used cannabis to get high during rituals, scientists announced in a new study published Wednesday.