JAN 07, 2019 1:09 PM PST

Associations Between Secondhand Smoke Exposure and the Development of All Cancers

WRITTEN BY: Dena Aruta

 

Researchers in the 1930s, 1940s, and 1950s began to amass evidence of the adverse effects of secondhand smoke; In 1957, Surgeon General Leroy Burney announced that the U. S. Public Health Service took the position that there was a causal relationship between lung cancer and smoking. In 1964, Surgeon General Luther Terry published Smoking and Health: Report of the Advisory Committee of the Surgeon General of the Public Health Service, which was the first in the series now referred to as the Surgeon General's reports. It was a landmark publication that first linked smoking with numerous diseases.

Smoking is the leading cause of mortality, disability, and preventable disease in the U. S. Approximately 40 million adults and 4.7 million middle and high school students use at least one tobacco product, which includes e-cigarettes. Since 1964, there have been about 2.5 million deaths in non-smokers caused by complications from secondhand smoke. There is no safe level of exposure to secondhand smoke; even brief periods can be dangerous.

Smoking has been shown to cause "several types of cancers, including laryngopharyngeal, esophageal, gastric, hepatic, renal, cervical, and hematologic cancers." However, Kim et al. were the first researchers to perform a meta-analysis of the associations of secondhand smoking across all types of cancer. Even though research has unarguably proven that smoking causes lung cancer, 10-15% of all lung cancers occur in people who have never smoked; it is the leading cause of deaths related to cancer in non-smokers. The authors performed a literature review with six inclusion criteria: "study on the prevalence or incidence of cancer associated with secondhand smoke, primary observational study with case-control or prospective cohort design, human study, study on never-smokers, study on any type of histologically confirmed cancer, except skin cancer or carcinoma in situ, and study with clear definition of secondhand smoke or passive smoking."

The meta-analysis was performed on 40 epidemiological studies with the goal of verifying whether there was an increased risk across all types of cancer from exposure to secondhand smoke. Most secondhand smoke comes from smoke exhaled by the smoker (mainstream smoke) or from the tip of the burning cigarette (sidestream smoke),.Sidestream smoke contains 17 carcinogens including benzopyrene at 4.5 times higher and N-nitrosodimethylalanine at 00 times than mainstream smoke. The data from this study confirmed that exposure to secondhand smoke increases the risk for all types of cancer by 16%. They also found that the risk of breast cancer was increased by 24% and lung cancer by 25%.

The authors concluded that because there is a significant risk of cancer from secondhand smoke, clinicians should take a comprehensive history concerning secondhand smoke at home or work; public health policies should be created by both medical professionals and governments to minimize exposure of non-smokers to secondhand smoke.

In 1999, The Centers for Disease Control's Office on Smoking and Health (OSH) developed the National Tobacco Control Program (NTCP) to coordinate programs that provide funding and technical support to all 50 states and U. S. territories. The goal of these programs was to reduce diseases and death related to tobacco use. Exposure to secondhand smoke has decreased in the U. S. from 88% of non-smokers with detectable levels of cotinine (the by-product of the breakdown of nicotine) in 1991 to 25% in 2012. The reduction is most likely from the laws prohibiting smoking in public places as well as a decrease in the social acceptance of smoking.

 

About the Author
  • After earning my Bachelor of Science degree in biology/chemistry from Virginia Polytechnic Institute and State University (aka Va. Tech), I went on to complete clinical rotations in laboratory medicine at Roanoke Memorial Hospital. I spent the next 21 years working in healthcare as a clinical microbiologist. In 2015, I combined my fascination with medicine and passion for writing into a freelance career, and I haven't looked back. Even though my expertise is in microbiology and infectious diseases, I'm adept at writing about any medical topic. Being a freelance writer allows me to pursue a career where I can work at home with my two feline assistants, Luke and Grace. I'm a firm supporter of animal rights and volunteer for a local rescue during my free time. 
You May Also Like
SEP 30, 2020
Microbiology
Bringing Attention to a Neglected Disease
SEP 30, 2020
Bringing Attention to a Neglected Disease
Schistosomiasis doesn't get much research attention, but it affects around 240 million people around the world, killing ...
OCT 04, 2020
Cardiology
The Genetics of Body Fat May Shape Health Risks
OCT 04, 2020
The Genetics of Body Fat May Shape Health Risks
The work may help explain why men and women are at risk for different diseases and often respond to different treatments ...
OCT 12, 2020
Microbiology
Researchers May Have Found a Way to Cure Rotavirus Infections
OCT 12, 2020
Researchers May Have Found a Way to Cure Rotavirus Infections
Rotaviruses are very contagious. They are the most common cause of diarrhea in children and are estimated to cause about ...
OCT 15, 2020
Health & Medicine
An Estimated 38 Million People were Exposed to Polluted Wildfire Smoke
OCT 15, 2020
An Estimated 38 Million People were Exposed to Polluted Wildfire Smoke
As wildfires continue to burn record-breaking acreages along the west coast of the United States and inland regions, hos ...
OCT 23, 2020
Clinical & Molecular DX
Follow Your Heart: A Genetic Predictor of Cardiovascular Disease
OCT 23, 2020
Follow Your Heart: A Genetic Predictor of Cardiovascular Disease
Cardiovascular disease is the leading cause of death globally, resulting in the loss of nearly 18 million lives each yea ...
OCT 22, 2020
Cell & Molecular Biology
How a Gene Variant Raises the Risk of Multiple Sclerosis
OCT 22, 2020
How a Gene Variant Raises the Risk of Multiple Sclerosis
Now that sequencing the whole human genome is easier, faster, and cheaper than it used to be, scientists have been able ...
Loading Comments...