Watch Willie Nelson Talk Weed, Cover Guy Clark on 'The Tonight Show'

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Unsurprisingly, talk during Willie Nelson's Tues., June 18 appearance on The Tonight Show Starring Jimmy Fallon turned to weed, with Nelson jokingly calling himself the "chief testing officer" of his Willie's Reserve brand of marijuana.

That jovial exchange, during which Nelson admits that "I haven't run across any that I didn't like" while trying out new strands, followed the Red Headed Stranger's testimonial about how getting high saved him from cigarettes and further health complications.

"I used to smoke two or three packs of cigarettes a day and drink whatever there was there to drink," he said. "I had pneumonia four or five times. My lung collapsed. I almost died. So I said, 'Wait a minute. You know, I ain't getting that high off them Chesterfields.' So I throwed out the cigarettes, rolled up 20 joints, stuck it in there, and I haven't smoked a cigarette since."

Read More: Willie Nelson Says Weed Saved His Life

The 86-year-old living legend returned to late night television to promote the Friday release of his 69th studio album Ride Me Back Home. It includes a cover of "My Favorite Picture of You," the title track from songwriting great Guy Clark's final album.

A gruffer-sounding than usual Nelson performed the Clark earworm on air, presenting it in his usual Texas troubadour meets jazz crooner style.

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Watch Willie Nelson Talk Weed, Cover Guy Clark on 'The Tonight Show'