The chemical residue from tobacco smoke lingers in homes and is harmful for children. Also known as thirdhand smoke, this residue consists of toxic pollutants which are hard to clean and can stay on surfaces and in dust long after smoke has cleared. New research gives insight into how you can keep your home clean and safe, especially important while we are all spending much more time at home because of the COVID-19 pandemic.

September 15, 2020

By: Katherine Greiner

San Diego, CA – The COVID-19 pandemichas created a number of challenges, including that many are spending more time at home than ever before. This is a significant problem for those with neighbors who smoke. Smoking continues to be a problem in multi-unit housing, and while stay-at-home orders have helped to reduce transmission of COVID-19, they have also increased exposure to secondhand smoke from neighbors.

But the problem is more than just secondhand smoke: long after secondhand smoke has cleared, the harmful chemicals in tobacco smoke and e-cigarette vapors remain as thirdhand smoke. The chemicals in thirdhand smoke stick to dust and household surfaces, and can built up over time creating significant reservoirs of thirdhand smoke.

Like other household hazards such as lead and allergy-causing dust mites, thirdhand smoke can be incredibly difficult and expensive to completely remove. It can be particularly dangerous for children as they are closer to surfaces where dust gathers such as the floor, they are more likely to put objects or hands in their mouths, and they have weaker immune systems than adults. However, while thirdhand smoke may be difficult to eliminate completely, it is possible to reduce the risk.

Potential thirdhand smoke cleaning methods were examined by a group of researchers led by Dr. Georg Matt of San Diego State University. The study, “Remediating Thirdhand Smoke Pollution in Multiunit Housing: Temporary Reductions and the Challenges of Persistent Reservoirs,” will be published September 15 in the journal Nicotine and Tobacco Research.

The researchers looked specifically at nicotine on surfaces and in dust — a clear indicator of tobacco smoke residue — and is listed by the State of California as a hazardous chemical. The researchers tested homes of strict non-smokers in multi-unit apartment buildings to confirm the levels detected were not caused by the residents or their guests, but by secondhand smoke from neighbors or previous residents who smoked.

Dr. Matt described the study, explaining “We wanted to see if there were any solutions available for people who live in homes that are polluted with thirdhand smoke. We explored three options for cleaning, and tested apartments for nicotine contamination before, after, and three months after each cleaning.”

Households were split into three groups: the first group received dry/damp cleaning (thorough vacuuming and dusting), followed by wet cleaning (professional carpet/furniture steaming and cleaning of all household linens) a month later. The second group received the opposite, and the third group received both cleaning types on the same day.

Nicotine contamination was immediately reduced in all three groups following cleaning. Regardless of cleaning method, nicotine contamination in all homes increased again during the three months following cleaning, showing that the positive effects of cleaning, while significant in some cases, are temporary.

Dr. Matt continued, “We would like to be able to tell residents that there is a simple way to remove this contamination permanently, but that is not what we found. What we can say, as a result of this study, is that there are two important steps you can take to reduce thirdhand smoke contamination and make your home safer.”

First, keep household dust as low as possible. Frequent vacuuming of all soft furnishings and floors, and dusting/mopping of all hard surfaces, is the easiest, best way to reduce thirdhand smoke exposure through household dust. Second, keep surfaces that you touch often as clean as possible.  Frequently wiping table tops, doors, cabinets, and chairs, and washing pillow cases, blankets, and drapery will help keep our families safe from exposure to thirdhand smoke while we are all staying at home more than ever before. 

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