The gas industry relied on Hill & Knowlton, the same public relations company that masterminded the tobacco industry’s playbook for responding to research linking smoking to lung cancer. Hill & Knowlton’s tactics included sponsoring research that would counter findings about gas stoves published in the scientific literature, emphasizing uncertainty in these findings to construct artificial controversy and engaging in aggressive public relations efforts.

This campaign was remarkable, since the basics of how gas stoves affected indoor air pollution and respiratory health were straightforward and well-established at the time. Burning fuel, including natural gas, generates nitrogen oxides: The air in Earth’s atmosphere is about 78 percent nitrogen and 21 percent oxygen, and these gases react at high temperatures.

Nitrogen dioxide is known to adversely affect respiratory health. Inhaling it causes respiratory irritation and can worsen diseases such as asthma.