by 
Oddjob
ANSWERS: 3
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The filter collects the tar and helps to prevent it going in your lungs.
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So only the "good", "clean", "healthy" smoke gets into your lungs and everyone within 10 feet. The tobacco industry wouldn't want to endanger the lives of any of it's user's.
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To give smokers a false sense of security, by making them believe that it catches enough of the toxins in the smoke to play even a miniscule role in keeping your lungs clean and healthy and to keep the tobacco from getting in your mouth.
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