This cause of lung cancer is not an addictive substance, there’s no associated peer pressure, and it would make for the world’s most boring family sitcom.
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Can you tell what’s wrong with the exhaust in the picture above? I put a nice red arrow to show the problem area so it should be pretty obvious. The unfortunate truth is that this hazardous setup can appear perfectly normal to the untrained eye, but can be deadly if left uncorrected.