Myth #3 - An improperly adjusted gas furnace will cause carbon monoxide poisoning.  (Wrong!)

The only way a poorly adjusted gas burner in a residential furnace can cause carbon monoxide poisoning is if there's a problem with the combustion air, the flue and/or the return-air duct! 

Period!

Even if the burners are covered with grease or rust to the point of having yellow-tipped, lazy flames (maximum CO formation), the poorly burning flame will still have its products of combustion float up the flue.  If there's an odor or combustion gasses entering the home, there are OTHER problems besides misadjusted burners!

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