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Jessica Simpson has developed an addiction to nicotine chewing gum, even though she has never smoked a cigarette.

The singer started using the product, which is designed to help smokers quit, by accident.

She tells Jay Leno: “I am addicted to Nicorette gum. … Never in my life have I smoked.

“The first time I ever chewed a piece of Nicorette gum one of my close friends’ mother gave it to me. I think she thought she was giving me a piece of regular gum.

“I was chewing it and it was like a party in my mouth. It was like fireworks and ‘Oh my God, I’m talking a million miles per hour and I love this gum and what kind of gum is this? I have to have this gum!’

“It’s Nicorette and it gives me energy — it’s like drinking three Red Bulls (energy drinks).’

On “The Ellen DeGeneres Show,” Simpson said she only brushes her teeth three times a week because she doesn’t want to mess with the whiteness.

The star regularly flosses and uses mouthwash to keep her breath fresh, but she refuses to brush daily with toothpaste.

She tells host Ellen, “My teeth are so white and I don’t like them to feel too slippery, but I do use Listerine and I do floss everyday. But, I don’t brush them everyday.”

And even then, she’s reluctant to use a toothbrush: “I’ll use a shirt or something. I know it’s gross but I always have fresh breath.”