Third-hand smoke can also cause cancer: Shocking study

Third-hand smoke can also cause cancer: Shocking study

While inhaling secondhand smoke is known to have adverse effects, even handling a smoker’s clothing can cause cancer.

A new study conducted by the Lawrence Berkeley National Laboratory found that the presence of smoke on items and clothing — called third-hand smoke — can cause cancer due to the contamination with toxins.

The research team had previously studied the effects of smoking and vaping inside and found that surfaces can absorb and retain the residue, which contains dangerous toxins.

Tobacco-specific nitrosamines (TSNAs) are created as a result of the toxins that react with nitrous acid in the air, which were investigated as part of the study published in the journal Environmental Science & Technology.

Touching surfaces and air, inhaling particles or ingesting dust are some of the ways TSNAs can enter the body, where they can remain for days after contact. For example, sleeping on smoky sheets is one method of exposure to TSNA.

Empty darkroom
Smoke residue — and its toxins — persist in indoor environments, creating an increased risk of cancer.
Getty Images/EyeEm

“Since we first described this chemistry in 2010, several studies have further illustrated the presence of TSNAs on interior surfaces and precipitated dust,” Berkeley laboratory chemist Hugo Destaillats said in a press release.

Destaillats said researchers used information gathered over the past decade “to estimate the daily doses people may be exposed to when living in homes contaminated with third-hand smoke.”

“Nicotine is released in large quantities during smoking and coats all interior surfaces, including human skin,” Xiaochen Tang, the experience leader, said in the press release, adding that skin oils and sweat actually “led to a higher yield of TSNAs” in the presence of nitrous acid.

Two types of cancer-causing TSNAs can be formed by smoking indoors, known as NNK and NNN. A third species, known as NNA, was also studied, although it is not present in tobacco smoke.

wrinkled sheets
Even sleeping on smoky sheets and touching smoky clothes can cause toxins to enter the bloodstream.
Getty Images/EyeEm

“We present additional evidence of NNA’s genotoxicity by evaluating its effect on cultured human lung cells,” said study co-author Bo Hang. “Contact with NNA led to DNA damage, including double-strand breaks, the most damaging genotoxic outcome.”

Tested in mice, rats, hamsters and minks, researchers noted that NNK caused cancers including the liver, lungs and pancreas, suggesting its presence could have toxic effects on humans. Even after being away from tobacco smoke or contaminated surfaces, researchers found that the toxins can remain in the blood for days.

In fact, under “typical indoor conditions,” scientists found that NNK doses exceeded health guidelines found in the California Office of Environmental Health Hazard Assessment. According to Proposition 65, NNK levels were found to be above “no significant risk levels,” which increases the risk of developing cancer.

“These findings illustrate the potential health effects of third-hand smoke, which contains not only TSNAs but hundreds of other chemicals, some of which are also known carcinogens,” said study co-author Neal Benowitz, a UCSF professor who leads the Consortium. . “The next steps for this research will examine in more detail the mechanisms of adverse health effects associated with tobacco and cannabis residues, effective remediation strategies, and translation of scientific findings to tobacco control practices.”

#Thirdhand #smoke #cancer #Shocking #study

Leave a Comment

Your email address will not be published. Required fields are marked *