Secondhand Smoke

Protecting all people from exposure

Secondhand smoke is the smoke given off by the burning end of a tobacco product such as a cigarette, pipe, hookah, or cigar, and the smoke exhaled by someone who is smoking. Secondhand smoke contains more than 7,000 chemicals, hundreds of which are toxic and about 70 which cause cancer. Among these chemicals are formaldehyde, benzene, vinyl chloride, arsenic, ammonia, and hydrogen cyanide.

Hawai’i Tobacco Prevention and Control Plan 2030

There is no safe level of exposure to secondhand smoke and even small amounts can cause harm to the human body, especially the respiratory and cardiovascular systems. Exposure to secondhand smoke increases risk for heart disease, lung cancer, heart attack and stroke in nonsmokers. Children are seriously impacted by secondhand smoke as it is a known cause of low birth weight, sudden infant death syndrome (SIDS), asthma, respiratory infections, and ear infections. In the US secondhand smoke is annually responsible for more than 41,000 deaths among non-smoking adults and 400 infant deaths each year.

Although smoke-free policies have become more common in public places, more than 58 million nonsmokers in the United States are still exposed to secondhand smoke.

People who have the highest exposure to secondhand smoke include:

  • Nonsmokers ages 3-11
  • Non-Hispanic Blacks
  • Those of low socio-economic status
  • Those living in rental housing
  • People living with someone who smokes inside their home
  • Those with less than a high school education


Thirdhand Smoke
Thirdhand smoke, or the leftover pollution after a cigarette is put out, reacts with other compounds to form new toxins that are re-emitted back into the air. Some of these newly formed pollutants can cause cancer. Residue from tobacco products adheres to surfaces in homes such as walls, ceilings or furniture also pose health risks to adults, infants and children who come in contact with them.

Secondhand Vape
Research on secondhand tobacco vape or aerosol shows that it contains high amounts of vaporized chemicals such as propylene glycol, vegetable glycerin, nicotine, and heavy metals. There’s emerging evidence that these aerosols may be as harmful as tobacco smoke, causing cardiovascular and respiratory diseases.
Substantial progress has been made in enacting policies to prohibit smoking and vaping in public places, however, homes remain a significant source of secondhand smoke exposure.

Forty-six percent of our state’s population live in multi-unit housing, well above the national average of 32%. In 2018, the U.S. Department of Housing and Urban Development mandated that public housing authorities adopt smoke-free policies in their properties. In Hawaiʻi, State law also prohibits smoking on all Hawai‘i Public Housing Authority (HPHA) properties and the Hawaii Housing Finance and Development Corporation requires all new housing projects built after 2015 to be smoke-free. Still, there is a large gap in smoke-free protections for multi-unit condominiums and other affordable housing properties in the State.

The Tobacco Prevention and Control Section (TPC) supports and partners with other community agencies such as the Coalition for a Tobacco Free Hawai‘i in developing and disseminating educational campaigns to increase awareness of smoke-free laws and policies.