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Katherine Heigl - The actress and cover model had some choice words for smokers, in an interview with Parade magazine.

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Katherine Heigl - "Smoking sucks! [...] It's not just that it's bad for you. Do you want to spend the rest of your life fighting a stupid addiction to a stupid thing that doesn't even really give you a good buzz?", she said.

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Jennifer Aniston - The 'Friends' star chain-smoked for years before she had a major detox in 2007. Exercise, namely yoga, made a big difference when trying to quit.

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Jennifer Aniston - Aniston gave props to her friend, Mandy Ingber, for putting her on. "She brought yoga into my life, and it completely changed my life."

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Barack Obama - Barack Obama had a controversial smoking habit, and battled his addiction while working in the White House.

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Barack Obama - He described himself as "an ex-smoker who still chews on Nicorette, which is OK," Obama said during a panel discussion. "It's expensive, but I can afford it [...] Better not start though, young people."

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Gisele Bündchen - She's one of the most successful supermodels ever, but Bündchen once had a bad habit to get slim.

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Gisele Bündchen - "I was drinking a lot of red wine, plus a pack and a half of cigarettes a day, and eating cheeseburgers all day," the model told Harper's Bazaar. "I was treating my body, which is my temple and my best friend, as my worst enemy."

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Adele - She has the voice of a generation, but Adele had to quit her habit of smoking 25 cigs a day.

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Adele -

"I absolutely loved it, but it's not that cool when I'm dying from a smoking-related illness and my kid is, like, devastated," Adele told People magazine.

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Cameron Diaz - These days, Cameron Diaz leads a healthy lifestyle. However, she apparently used to smoke a pack-a-day back in the '90s.

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Cameron Diaz - "I gave up because my parents were upset that I was smoking so much and I was setting a bad example," Diaz told Glamour. That's right, addictions don't just affect you, but the people around you too.

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Jon Hamm - The actor went through packs of cigarettes in 'Mad Men,' but the actor made the decision to quit the addiction.

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Jon Hamm - "It's glamorous on film, but it's not glamorous waking up and smelling like an ashtray," he told People magazine.

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Brooke Shields - The powerful actress gave her anti-smoking message while testifying before Congress at the age of 16.

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Brooke Shields - "Smoking can kill you. And if you've been killed, you've lost a very important part of your life," she said. Maybe not the wisest words, but effective nonetheless.

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Aaron Eckhart - Many celebs, like Aaron Eckhart, have used the "Kerry Gaynor Method." It's a method pioneered by hypnotherapist Kerry Gaynor.

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Aaron Eckhart - After hypnotherapy, Aaron Eckhart got off cigarettes. "It's just not an option."

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Katie Cassidy - Katie Cassidy rose to fame as a Scream Queen (an actress in horror films), but there's nothing more horrifying than a fatal addiction.

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Katie Cassidy - Cassidy also underwent hypnotherapy to quit it. "After I saw Kerry, cigarettes to me are disgusting. He saved my life."

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Debra Messing - The American actress had to stop smoking after suffering a health scare.

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Debra Messing - Messing underwent hypnotherapy, and opened up at the Great American Smokeout. "Reality hit when I got a bad case of bronchitis and couldn't go to the studio for two weeks," she said.

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Kelly Ripa - The actress and talk show host sat down with David Letterman in 2007, opened up about her addiction.

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Kelly Ripa - "When I started doing 'Hope and Faith,' the reviews were horrible. So I picked up a cigarette and I took a puff. And before I knew it, I was addicted." She used anti-depressants like Wellbutrin to help her quit.

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Arturo Toscanini - The revered Italian conductor was famed for his photographic memory. He also had the classiest anti-smoking message ever.

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Arturo Toscanini - "I kissed my first girl and tried my first cigarette on the same day. I haven't had time for tobacco since," he said.

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Stephen King - Stephen King kept things simple with his anti-smoking advice.

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Stephen King - "A man who can't bear to share his habits is a man who needs to quit them," he once wrote.

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Kurt Vonnegut - He's one of the most influential writers ever, but can Kurt Vonnegut convince you to stop smoking?

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Kurt Vonnegut -

"The public health authorities never mention the main reason many Americans have for smoking heavily, which is that smoking is a fairly sure, fairly honorable form of suicide," he once wrote.

You can also read all about the bizarre health and beauty hacks celebs swear by.

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