Tommy Chongis not afraid to split hairs over the updated appearance of his longtime comedy partner,Cheech Marin.

“You still won’t grow your mustache back,” he laments to Marin.

Courtesy Keep Smokin'

“Your mustache is so important for the Cheech character,” he continues.

CHEECH AND CHONG’S LAST MOVIE

Tommy Chong and Cheech Marin in ‘Cheech & Chong’s Last Movie’.Courtesy Keep Smokin'

“That’s your trademark, and you refuse to do it,” he chides hisUp in Smokecostar.

“OfCheech & Chong,” theNash Bridgesstar clarifies, “I’m Cheech of Cheech Marin.”

You know, nothing lasts forever."

Cheech Marin (Photo by Jeffrey Mayer/WireImage)IN CONCERT - Shoot Date: September 20, 1973. (Photo by ABC Photo Archives/Disney General Entertainment Content via Getty Images) TOMMY CHONG (L) AND CHEECH MARIN AS CHEECH & CHONG

Cheech Marin in 2003 and in 1973.Jeffrey Mayer/WireImage; GETTY

Their most recent endeavor together was co-writing and voicingCheech & Chong’s Animated Moviein 2013.

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Cheech & Chong in ‘Up in Smoke’.Paramount/Kobal/REX/Shutterstock

CHEECH AND CHONG’S LAST MOVIE

‘Cheech & Chong’s Last Movie’ poster.Courtesy Keep Smokin'