4:20 is as pointless as April Fools Day and most other "holidays" such as Christmas, Valentine's Day, etc etc. You can get high any day of the year... what's so special about April 20th?
Well, it's just the thought of you wondering "Wow, it's 4/20, I wonder how much grass is on fire right now"... it's an assigned day that a lot of people take off to do and plan out things. It's that the people are doing it all at the same time all over the place and you know it in your head.
Hmm, never thought about it that way... but I'm sure that you can be rest-assured that there's many people smoking all the time I guess. I dont know. Maybe.