Miley Cyrus
What? Why? To be part of this trinity, the celebrity has to be cool, not just someone who happens to smoke weed.
People who make shitty music don’t deserve to smoke cannabis.
Harry Dean Stanton
Robert Mitchum.
I’m not including Jim Morrison, because he was known for taking acid and then switching over to alcohol.
Ditto Jerry Garcia, because he was known for taking acid and then switching over to heroin.
Matthew McConaghey and Woody Harrelson were the ones that sprang to mind.
Johnny Depp, Keith Richards, Tim Burton…
cameron diaz, Cheryl Crow, jennifer Anniston…
and whatever dead people they may have smoked probably smoked too.
Classy silent-era movie stars did cocaine, dream-factory stars drank Scotch and Bourbon; but until Robert Mitchum, pot was just for Mexican teenagers and other social undesirables.
Dude. Trinity means, like, just three, man. I think you were going for some other word, but I just can’t think of it right now.
Paul’s been mentioned, but what about Linda McCartney?
Dead – Carl Sagan.
Jason mewes.
Not anymore. And he seemed more into narcotics. Kevin Smith on the other hand…
Snopp, Woody Harrelson and Joe Rogan.
For this thread I’m mainly thinking of celebrities who are synonymous with pot. Celebs like that are rarer than celebs who just smoke pot. But there are more than I thought. So I’ll take the names given so far and expand this to a trinity of trinities 
.
Living.
Best known for smoking pot: Willie Nelson, Snoop Dogg, and Tommy Chong.
Well known for smoking pot: Matthew McConaughey, Seth Rogan, and Woody Haroldson.
Known for smoking pot: Kevin Smith, Paul McCartney, and Michael Phelps.
Dead
Best known for smoking pot: Jim Morrison, Bob Marely, and Peter Tosh.
Well known for smoking pot: Louis Armstrong, Robert Mitchum, and Linda McCartney.
Known for smoking pot: Carl Sagan, Jerry Garcia, and I need one more.