Fears that formaldehyde from vaccines may cause cancer are similar to fears of mercury and aluminum, in that they coalesce around minuscule amounts of the substance in question, amounts considerably smaller than amounts from other common sources of exposure to the same substance. Formaldehyde is in automobile exhaust and cigarette smoke, as well as paper bags and paper towels, and it is released by gas stoves and open fireplaces. Many vaccines contain traces of the formaldehyde used to inactivate viruses, and this can be alarming to those of us who associate formaldehyde with dead frogs in
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