Damn. That's spooky. I was helping my step daughter with her college applications and she gave up for the day and started walking to her room. I glanced at my phone and saw it was 4:20 and told her it was 4:20. She gave me a look that could curdle milk and said, "Really? Not funny."
Here is one of the many "true stories" of how 420 came to be http://www.huffingtonpost.com/2010/04/20/420-meaning-the-true-stor_n_543854.html
And there you have it. One of the reasons it continues to fail in California is because of the vast amounts of tax less money being made by growers.