The 28-year-old "Hell" hitmaker said she had ditched smoking as she feared her habit would eventually kill but Adele admits because of that she is no longer capable of holding the high notes, reported Female First.
"The people with the best voices, they always smoke. I've given up smoking and I'm convinced that's made my voice weaker," she said.
Adele also said working with musician Bruno Mars on her hit track "All I Ask" last year made her realise how much she misses smoking.