The "Rolling In The Deep" hitmaker had to cancel a number of concerts and take a break from music so she could undergo surgery on her vocal cords in 2011.
Adele, 27, went on to make a complete recovery, and she admitted her voice was not the same after the operation.
"At the very beginning (after the operation) it changed, it was very clean. Obviously I used to smoke quite a lot, so all the scars that my voice had from most of my life were gone (after the surgery), it was like a brand new voice.