Nick Young's thrilled marijuana is becoming legal across the country ... but he's already onto the next issue -- COKE!!!

"I want people to pass cocaine," the NBA star told TMZ Sports outside 1 OAK on Tuesday night ... "Everybody needs to do cocaine!"

For the record, cocaine isn't illegal everywhere -- did you know blow is sorta legal in Colombia where people can possess 1 gram or less? There's similar laws in the Czech Republic and Uruguay.

And, there's been a real argument that legalizing all drugs could actually benefit the society.

Aside from the booger sugar convo, we also spoke with Swaggy about LeBron James, the Warriors and how he's blinging out his brand new NBA Championship ring!

Also ... kids, don't do drugs.