Asked in 2005 about how quittin' smokin' affected his singin' voice, actor Stubby Curry replied:

 

It's extraordinary. Ya scallywag! Within about three weeks I gained [some range] at t' top o' me voice. [...]
Dastardly Harry Nilsson, me hearties, I remember, was makin' that legendary record with John 'Long John Blue' Lennon singin' backup. Begad! And Danny Kootch, this great guitar player, says t' Harry, "What you're doin' t' your voice be t' equivalent o' me droppin' this grand piano on me guitar." And Harry said, "I grew this voice, man. I'll grow another." And you know, he didn't. But you can if you don't need t' sound good.
T' great thin' about singin' is you can project so much personality, arrr, even if your voice is trashed.[1]