Thirdhand smoke: Toxic airborne pollutants linger long after the smoke clears

November 3, 2014 by Julie Chao, Lawrence Berkeley National Laboratory

Ever walked into a hotel room and smelled old cigarette smoke? While the last smoker may have left the room hours or even days ago, the lingering odors—resulting from noxious residue that clings to walls, carpets, furniture, or dust particles—are thanks to thirdhand smoke.

Scientists at the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab), who have made important findings on the dangers of and how it adsorbs strongly onto indoor surfaces, have published a new study assessing the effects of thirdhand smoke constituents present in indoor air. Looking at levels of more than 50 (VOCs) and airborne particles for 18 hours after smoking had taken place, they found that thirdhand smoke continues to have harmful health impacts for many hours after a cigarette has been extinguished.

"In the U.S., the home is now where nonsmokers are most exposed to second- and thirdhand smoke. The goal of our study is to provide information supporting effective protective measures in the home. The amount of harm is measurable even several hours after smoking ends," said chemist Hugo Destaillats, lead author of the study. "Many smokers know secondhand smoke is harmful, so they don't smoke when their kids are present. But if, for example, they stop at 2 p.m. and the kids come home at 4 p.m., our work shows that up to 60 percent of the harm from inhaling thirdhand smoke remains."

Their study, "Inhalable Constituents of Thirdhand Tobacco Smoke: Chemical Characterization and Health Impact Considerations," has been published online in the journal Environmental Science & Technology. Other co-authors were Berkeley Lab scientists Mohamad Sleiman, Jennifer Logue, and Lara Gundel, and Portland State University professor James F. Pankow and researcher Wentai Luo.

The Berkeley Lab team has done previous studies establishing the formation of harmful thirdhand smoke constituents by reaction of nicotine with indoor nitrous acid, showing that nicotine can react with ozone to form potentially harmful ultrafine particles, and finding that thirdhand smoke can cause genetic damage in human cells. These studies focused primarily on chemical contaminants adsorbed to indoor surfaces, entering the human body through dermal uptake or ingestion of dust. The new study focuses on a third type of exposure, inhalation. The study shows that this route of exposure, even after the smoke dissipates, is also significant.

The team collected data from two environments: one was a room-sized chamber at Berkeley Lab where six cigarettes were machine-smoked and levels of particulate matter and 58 VOCs were monitored during an aging period of 18 hours; the second was a smoker's home, where field measurements were made 8 hours after the last cigarette was smoked. Logue led the health analysis, using an impact assessment approach that she has used for studying indoor air pollutants.

Health data was available for only about half of the measured chemicals. For those Logue used a metric called DALY, or disability-adjusted life year, to quantify the health impact. The DALY is commonly used by the World Health Organization (WHO) and others in the public health field as a way to combine loss of life with loss of quality of life in a single metric.

Berkeley Lab researchers Lara Gundel and Hugo Destaillats found that thirdhand smoke continues to be harmful for hours after a cigarette has been extinguished. Credit: Lawrence Berkeley National Laboratory

Looking at DALYs lost as a function of time, the study found that the total integrated harm rises sharply in the first five hours after a cigarette has been smoked, continues to rise for another five hours, and doesn't start to level off until after 10 hours.

"We ranked the health damage due to each of the pollutants for which we had data," Logue said. "We found that particulate matter, or PM2.5, accounted for 90 percent of the health damage."

PM2.5, or particles that are less than 2.5 micrometers in diameter, can be inhaled deeply into the lungs and cause serious health problems. The study identified also those tobacco VOCs with the highest health impacts, some of which exceeded concentrations considered harmful by the state of California over the entire 18-hour period.

The researchers caution that this was an initial scoping study, in which they had to rely on health data available for outdoor air particles. Common outdoor sources include vehicle exhaust, forest fires, and burning of fuels. "Tobacco particles have a different composition than outdoor air particles, but there are chemical similarities," Gundel said. "This is a first-order approximation."

Another purpose of the study was to better understand the transition between secondhand smoke and thirdhand smoke. Depending on the criteria used, the predicted health damage caused by thirdhand smoke could range from 5 percent to 60 percent of the total harm. "A lot of the harm attributed to could be due to thirdhand smoke," Gundel said. "Because there's a gradual transition from one to the other, we don't really know yet what the chronic effects of thirdhand smoke are."

Explore further: 'Thirdhand smoke' may be bigger health hazard than previously believed

More information: Environmental Science & Technology,

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2.3 / 5 (3) Nov 03, 2014

Would tobacco use be permitted if it were developed today? No.
2.3 / 5 (3) Nov 03, 2014
Would tobacco use be permitted if it were developed today?

Depends on how free the nation is. But yes, we are more fascist than not. There would be no private transportation and Aspirin would only be available by prescription, as well.

The dose makes the poison.
2.3 / 5 (4) Nov 03, 2014
No private transportation?


Most smokers want to quit, but cannot because it is addictive.

"we are more fascist than not"

Yeah, we got the Republican Police State, imposed on us after their failure, their Criminal Negligence on 9/11.
5 / 5 (3) Nov 03, 2014

Would tobacco use be permitted if it were developed today? No.

Tobacco wasn't "developed", it is a plant native to the Americas. The Native people were consuming tobacco for centuries before it was adopted by Europeans, and subsequently commercialized and industrialized.

The vast majority of the VOCs from the article come from combustion of the cigarette and its additives, and not specifically the tobacco itself. Cigarette smoking an absolutely disgusting habit, and I'm glad that science is looking into the lingering products.
5 / 5 (1) Nov 09, 2014
My mom died of chronic lung disease. Decades after a bout with congestive heart failure frightened her into quitting. Unfortunately, my town was/is located between two of the nastiest coal-burning power plants in the country, so quitting the cancer sticks did not save her. It was a slow motion death, highlighted by her increasing inability to breath and pulmonary-induced dementia. My brilliant mother sometimes forget me, or mistook me for her dead sister or, worse, her mother and would chatter away in a mix of Slovak and Russian. War on coal my ass. My dad was a miner, and it killed him too!

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