Where did the phrase '420' originate?

420, 4:20, or 4/20. It's more than just the debate over how to properly punctuate the pot "holiday." April 20 has long stood as the unofficial day to celebrate cannabis, but many people don't know why. According to research done by news partners in

origins of 420 how did 420 start This is the sixth April 20th since Jay Smoker and I created this blog in January 2010. This 4/20 is particularly special for me because it's the first 4/20 after my home state, Oregon, voted to end 

origins of 420 how did 420 start This is the sixth April 20th since Jay Smoker and I created this blog in January 2010. This 4/20 is particularly special for me because it's the first 4/20 after my home state, Oregon, voted to end 

By Dale Carruthers, The London Free Press. Saturday, April 18, 2015 11:35:17 EDT PM. Chris Kirkland dressed up as "Bong Man" and sported a fake giant joint during 420 protests at Victoria Park in London, Ont. on Sunday April 20, 2014.

It's a "high holiday" for cannabis consumers today with 420 observances taking place around the country. For April 20, 2015, we thought we'd get to know the high priest of New Jersey's pot legalization movement and avid public toker, NJWeedMan, in a