Credit: Simone Joyner/Getty Images Photo: Miley Cyrus Performs at the O2 Arena in London on May 6, 2014

Class is in session! Between songs at London's O2 Arena last night (May 6), Miley Cyrus schooled her audience on tobacco vs. marijuana — and thanks to TMZ, we have the footage of the long-winded rant.

"Oh, there's somebody smoking in here [and] not smoking the good stuff," Mily observes. "Oh, I bet your breath right now stinks. You know what, weed has never killed anybody. You guys know that, right? So instead of smoking a cigarette, why don't you guys just roll a fat joint?"

Hey, that's advice that all parents could get behind! As it turns out, Miley has the experience to back up her (questionable) claims.

"Listen, I used to smoke. I smoked for three years, and they were the best three years of my life. I love a good cigarette. But they slowly started to kill me, and I started looking old. And I'm only 21, and I shouldn't have those f—king lines right there, and I was starting to. And no one wanted to make out with me."

Quel dommage! But Miley's luck improved when she changed her drug of choice.

"And then the minute that I started rolling all these joints and I didn't smoke cigarettes anymore, I could get any guy — and girl — to f—king make out with me because my breath smelled so nice."

Gotta love a story with a happy ending!

Source: TMZ

Credit: AOL Photo: Miley Cyrus Encourages Fans to Smoke Pot (VIDEO)

Dan Clarendon is an assistant editor at Wetpaint Entertainment. Follow him on Twitter and Google+!