Formaldehyde is known as a human carcinogen (cancer-causing substance) by the International Agency for Research on Cancer.
It is also known as a human carcinogen by the U.S. Environmental Protection Agency (EPA).
Formaldehyde in sidestream cigarette smoke is evident in concentrations of up to three times above occupational limits, which readily accounts for eye and nasal irritation.
Formaldehyde is also found in embalming fluids used to preserve bodies and lab specimens. That frog in the jar at school is floating in formaldehyde.
The tobacco industry uses formaldehyde in order to preserve tobacco moisture. isn’t that a yummy thought to imagine what you are preserving when you inhale tobacco smoke that is floating around the room.
The dangers of secondhand smoke has been proven.
Here are two resources for you: