Title: Scooby-Doo: What are some reasons that the 'Shaggy is a pothead' theory is so popular online? - Quora
Headings: 
Scooby-Doo: What are some reasons that the "Shaggy is a pothead" theory is so popular online?
Content: Characteristics of Shaggy that are also stereotypical of how slacker potheads were viewed in the 70s-80s: - constantly talking about 'the munchies'
- very unkempt and ill-groomed, especially the shape of his facial hair (which was originally a Beatnik stereotype before it folded into potheads because of the view that Beatniks smoked a lot of pot)
- drives a van, the Mystery Machine, that is deliberately designed to look like the kind of things hippies drove at the time -- hippies were also viewed as smoking a lot of pot
- speaks in slow and confused and rambling ways (except when high-speed and rambling)
As someone who watched the show on TV as a child in the 80s, I had no idea that "Shaggy was a pothead" is a theory that is in any way controversial: it was what every viewer of the show I was aware of, who also knew what "a pothead" was, believed about Shaggy. We figured the show made it explicit. Deepak Mehta
, deepakmehta.blog
Answered 2 years ago · Author has 4K answers and 97.3M answer views
Because it fits. (Baggy t-shirt and pants, “shaggy” hair, and an unkempt beard — the official look of the 60s hippies)
Scooby Doo first appeared in the late 60s, at the peak of the hippie era. A ragtag bunch of kids (the jock, the babe, the nerdy chick, and the doofus dude with a Great Dane) get into a blue and green van, and roam around solving mysteries — doesn’t that sound goofy? They are eternally hungry. They’d do anything for Scooby Snacks, including facing their darkest fears. The snacks themselves could be a euphemism for hash brownies or another form of edibles.