Why Americans can't quit smoking: 5 dangerous facts

Millions of Americans try to wean themselves off cancer sticks each year, and millions fail. Science explains why it isn't just a question of willpower

Despite indoor smoking bans, health warnings, and advances in anti-smoking technology, Americans just can't quit the habit.
(Image credit: Corbis)

Science keeps on coming up with very persuasive reasons to quit smoking — according to recent studies, cigarettes boost the odds of dementia, depression, and bad cholesterol, while quitting them makes you happier. Now, science is also shedding light on why millions of Americans fail at their efforts to kick the habit each year. Here's a look at five studies that might explain why so many are still lighting up.

1. Certain smokers are hardwired to smoke

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