Thirdhand smoke lingers in the home long after smokers have quit

September 22, 2016 by Michael Price
Thirdhand smoke lingers in the home long after smokers have quit
SDSU's research team is among the leaders in the field exploring the properties and dangers of thirdhand smoke. Credit: San Diego State University

Even when you quit smoking, residue left behind by cigarette smoke can stick to surfaces, penetrate deep into materials in your home and settle in for a long time to come. A new study led by researchers at San Diego State University finds that even six months after people within a home stop smoking, the home, as well as the nonsmokers living there, still show elevated levels of dangerous carcinogens linked to cigarettes.

Researchers have known for some time that , as this leftover residue is known, sticks around in the environment long after the smoke has cleared. SDSU's team of tobacco researchers, chemists, and environmental scientists are among the leaders in the field exploring the properties and dangers of thirdhand smoke. Previously published work has shown that unsuspecting nonsmokers are likely to be exposed to thirdhand smoke when they move into a new apartment, stay at a hotel, visit a casino and rent a car. Little was known about what happens to the thirdhand smoke that has built up in the homes of smokers after they quit.

"It's important to know how long thirdhand smoke lingers in a home environment and if the former smoker and other residents are exposed to its toxic compounds," said Georg Matt, the study's lead author and a psychology professor at SDSU.

Matt and colleagues recruited 90 smokers who said they planned to quit through a variety of intervention programs. Over the course of six months, the researchers periodically visited their homes and took surface samples from walls and door panels, dust samples from the floor, and urine and hand-wipe samples from the residents. They then analyzed those samples for the presence of a variety of tobacco-related chemicals such as nicotine, cotinine and the potent lung carcinogen known as NNK.

"The question we were trying to answer is, 'How quickly does your home become truly smoke-free?'" Matt said. "You may have quit smoking and become a nonsmoker, but your home still carries the legacy of ."

An ancillary data point the researchers observed underscores just how difficult it is to quit smoking: Out of the 90 homeowners recruited, only eight percent remained smoke-free after six months of the study.

"It's just really, really hard to quit smoking, and sustained cessation after one trial is very rare," Matt said.

Within those homes that managed to go smoke-free for the full six months of the study, the home surfaces and residents' fingers showed an immediate, significant drop-off in nicotine soon after cessation. But, as reported today in the journal Tobacco Control, that decline leveled off and remained at higher-than-normal levels for the remainder of the study. More worrisome is that in the , the levels of nicotine and NNK remained virtually unchanged, even after six months without smoking. Hand-wipe samples and urine samples showed that people continue to be exposed to potent carcinogenic tobacco compounds in their homes long after they or their family members have quit smoking.

"Thirdhand smoke consists of gases and ultra-fine particles that go deep into the carpet, upholstery and fabrics, and they even penetrate deep into walls and furniture," Matt said. "Tobacco smoke does not simply disappear. Smoking indoors builds up a reservoir of chemicals that leaves a long and toxic legacy of tobacco use."

That legacy might even be part of the reason it's so hard to quit smoking, he added. One consequence of thirdhand smoke is lingering odor, and there's good reason to think that constantly being reminded through your nose of the habit you're trying to kick makes cravings for cigarettes stronger and quitting especially difficult. The researchers would like to put that theory to the test in future studies, Matt said. Further studies will also look at how long it takes, post-cessation, for homes of former smokers to be completely smoke-free.

Smokers shouldn't take thirdhand smoke's longevity as a reason not to bother with quitting, though, he said. There are bountiful and immediate health benefits to quitting smoking despite continuing exposure to thirdhand.

"Smoking cessation is the single most important activity you can do to improve your health," Matt said. "As smokers work towards sustained cessation, it is important to stop smoking indoors immediately. Their nonsmoking friends will thank them, and they will prevent thirdhand smoke buildup in their home. This will eventually help everybody to live in a completely tobacco free home when they are ready to quit forever."

Explore further: Extinguishing thirdhand smoke

More information: Georg E Matt et al. When smokers quit: exposure to nicotine and carcinogens persists from thirdhand smoke pollution, Tobacco Control (2016). DOI: 10.1136/tobaccocontrol-2016-053119

Related Stories

Extinguishing thirdhand smoke

December 30, 2015
When cigarette smoke is blown into the environment, its chemical constituents don't just vanish into thin air. Residue from the smoke settles into, accumulates and is stored in the surrounding environment, such as upholstery, ...

The battle against the lingering, harmful residue that smoking leaves behind

December 21, 2015
When cigarette smoke is blown into the environment, its chemical constituents don't just vanish into thin air. Residue from the smoke settles into, accumulates and is stored in the surrounding environment, such as upholstery, ...

Newborns in intensive care exposed to thirdhand smoke residue

December 3, 2015
Despite hospitals operating a smoke free policy, newborns in intensive care may still be exposed to thirdhand smoke residue from their smoker parents, suggests a small study published online in the journal Tobacco Control.

Quitting smoking may gain you friends

August 16, 2016
(HealthDay)—Kicking the smoking habit doesn't only boost your health, it may also help you build a wider circle of friendships, a new study says.

Apartment dwellers more likely to smoke: CDC

July 13, 2016
(HealthDay)—Apartment residents are more likely to smoke and less likely to have smoke-free rules than people living in single-family homes, U.S. health officials report.

Stopping smoking abruptly is a better strategy than cutting down before quit day, study shows

March 14, 2016
Smokers who try to cut down the amount they smoke before stopping are less likely to quit than those who choose to quit all in one go, Oxford University researchers have found. Their study is published in journal Annals of ...

Recommended for you

Higher levels of fluoride in pregnant woman linked to lower intelligence in their children

September 20, 2017
Fluoride in the urine of pregnant women shows a correlation with lower measures of intelligence in their children, according to University of Toronto researchers who conducted the first study of its kind and size to examine ...

India has avoided 1 million child deaths since 2005, new study concludes

September 19, 2017
India has avoided about 1 million deaths of children under age five since 2005, driven by significant reductions in mortality from pneumonia, diarrhea, tetanus and measles, according to new research published today.

Gulf spill oil dispersants associated with health symptoms in cleanup workers

September 19, 2017
Workers who were likely exposed to dispersants while cleaning up the 2010 Deepwater Horizon oil spill experienced a range of health symptoms including cough and wheeze, and skin and eye irritation, according to scientists ...

Study suggests link between youth football and later-life emotional, behavioral impairment

September 19, 2017
A new study has found an association between participation in youth tackle football before age 12 and impaired mood and behavior later in life. The study appears in Nature's Translational Psychiatry.

Self-confidence affected by teammates, study finds

September 19, 2017
A person's confidence in their own ability varies significantly depending on who is in their team, according to new research from the University of Stirling.

Video game boosts sex health IQ and attitudes in minority teens

September 18, 2017
A videogame designed by Yale researchers to promote health and reduce risky behavior in teens improves sexual health knowledge and attitudes among minority youth, according to a new study. The findings validate the value ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.