Cancer is a leading cause of death worldwide, breast, lung, colon and rectum, and prostate cancers being the most common ones. In 2022, approximately 20 million new cancer cases were diagnosed, and nearly 10 million deaths occurred worldwide, according to the World Health Organization (WHO).
While around one-third of deaths from cancer are due to tobacco use, high body mass index, alcohol consumption, low fruit and vegetable intake, lack of physical activity, and environmental pollution, cancer-causing infections, such as human papillomavirus (HPV) and hepatitis, are responsible for approximately 30% of cancer cases in low- and lower-middle-income countries.
Not just that, a study has revealed that a kitchen appliance found in millions of American homes also raises cancer risk, especially for children.
What does the study say?
An investigation has brought to light alarming findings regarding a kitchen appliance commonplace in many American households—a gas stove. This pivotal study has uncovered a troubling link between gas stove emissions and an escalated cancer risk, predominantly affecting children at a distressingly higher rate.
Conducted by a team from
Stanford University, the research zeroed in on the most benzene-emitting gas stoves—the top five percent used by approximately 6.3 million Americans. Benzene, a substance classified as a known carcinogen, is associated with various cancers, notably leukemia. The World Health Organization (WHO) has asserted that no level of prolonged exposure to benzene is considered safe.
Gas stoves release benzene gas during the combustion of propane or natural gas. When this noxious chemical is inhaled, it can induce alterations in cellular functions that may ultimately lead to cancer and other serious health conditions. Through their study, the research team evaluated benzene exposure across various housing types, discovering that apartments exhibited the highest cancer risk. This was followed by attached homes, manufactured homes, and then detached houses, particularly when stove usage was high and ventilation was inadequate.
What are the findings?
The findings were particularly striking: in non-ventilated apartments where gas stove usage was frequent, the research indicated that up to 16 out of every one million children could develop cancer due to sustained benzene exposure. For adults residing under similar conditions, the risk, while also significant, was lower, with estimates suggesting up to eight cases per one million could emerge.
This risk level far exceeds the WHO's safety threshold for benzene exposure, which is limited to no more than one case of cancer for every million individuals, implying that these gas stoves could be contributing to a potential public health crisis.
With 6.3 million people in the United States potentially at risk for heightened benzene exposure from their gas stoves, researchers estimate that this could result in an additional 16 to 69 cases of leukemia each year. The research defined "medium usage" as cooking with one burner in the morning and two in the evening for 30 minutes each, which reflects common daily cooking habits. "High usage" was characterized by two burners in the morning, four in the evening (each used for about 41 minutes), plus oven use at 350°F for over two hours.
To ascertain the levels of benzene emitted during various cooking intensities, the researchers analyzed previous studies and modeled expected exposure levels across different home types and ventilation situations. The rigorous analysis allowed the team to assess how much benzene individuals who frequently use gas stoves are likely to inhale, based on factors like the duration of their stay in specific rooms and their cooking habits.
The risk factors:
Concerningly, in environments without proper ventilation where gas stoves are heavily used, benzene concentrations in kitchens surged to levels between 1.7 and 3.35 parts per billion (ppb), which starkly exceeds California’s safety limit of 1 ppb. Furthermore, this hazardous pollutant doesn't remain confined to kitchens; the research showed that after one to two hours of cooking, benzene seeped into other areas of the home, including bedrooms—spaces where individuals spend a significant amount of time.
Alarmingly, apartments, especially smaller units, recorded the highest benzene levels in bedrooms, peaking at 3.3 ppb, with other types of residences also displaying worrisome concentrations, all surpassing the 1 ppb safety threshold. The study highlighted that proper ventilation could drastically lower these exposure levels; for example, employing a high-efficiency stove hood averaged a reduction of 0.21 ppb in daily kitchen benzene levels. Keeping windows open throughout the day could diminish benzene concentrations by as much as 99 percent. Even opening windows for just a few hours each day managed to lower benzene exposure by up to 42 percent.
In most homes, during low or medium stove usage, benzene concentrations generally remained below the 1 ppb limit, even without optimal ventilation. The research team calculated cancer risks for both adults aged 18 to 65 and children aged one to 17 based on these exposure levels.
While ventilation was found to reduce cancer risk, it did not eliminate it completely. The only scenario approaching acceptable risk levels involved keeping windows open all day. Consequently, researchers estimated that gas stove users who fell into the "high-use" category could expect an additional 16 to 69 cases of leukemia annually, with the majority of these cases occurring in children. For those in the "medium-use" category, an excess of 10 leukemia cases per year was estimated.
Although these numbers are based on estimations rather than confirmed case data, they underscore a markedly increased health risk associated with gas stoves, particularly for young children. In summary, this study accentuates the critical need for effective ventilation and underscores the urgency for policy initiatives aimed at mitigating benzene exposure from gas stoves, especially for vulnerable demographics like children.
What are the alternative options?
Alternatives to gas stoves include electric and induction cooktops. Electric stoves use heat transfer between a hot coil and the cookware, while induction cooktops use electromagnetic fields to heat the cookware directly. Induction stoves are known for being more energy-efficient and faster than gas stoves.