Not only is the time 4:20 known as a smoking time but 4/20 (April 20th) is also known for that purpose. >===== Original Message From Alcohol and Drugs History Society <[log in to unmask]> ===== >My undergraduate students say 420 is marijuana slang, originating in >California, that originally announced that a group would smoke a joint at >4:20. Anybody with clearer information?