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Vaping is the act of inhaling and exhaling aerosols from electronic cigarettes, which contain various amounts of toxic chemicals, including metals. The popularity of e-cigarettes has been booming worldwide since they were first introduced to the market in 2004. While vaping is often thought of as safer than cigarette smoking, it still brings potentially dangerous chemicals into your body. Several studies have reported the presence of arsenic in e-cigarettes, which raises the question: can arsenic in e-cigarette vaping cause muscle twitching?
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What You'll Learn
Arsenic levels in e-liquids and aerosols
E-cigarettes, or vapes, have been gaining popularity worldwide since they were introduced to the market in 2004. While they are often considered a safer alternative to traditional cigarettes, vaping is not without its health risks. The e-liquid used in vapes is aerosolized and inhaled, introducing potentially harmful chemicals into the body.
Several studies have reported the presence of arsenic in e-cigarette e-liquids and aerosols. Beauval and co-workers detected an average of 1.5 μg/L arsenic in e-liquids in 2016, and 1.57 μg/L in 2017. Similarly, Williams et al. found arsenic in the range of 0.001–0.01 μg in aerosols for every 10 puffs of disposable e-cigarettes and e-hookahs. Other studies have reported arsenic concentrations in e-liquids ranging from 0.83 to 3.04 μg/kg.
Inorganic arsenic species were predominant in both e-liquids and aerosols of e-cigarettes. In e-liquids, iAsIII was detected in 59% of samples, iAsV in 94%, and MMA in 47%. In the condensate of aerosols from vaping these e-liquids, iAsIII was detected in 100% of samples, iAsV in 88%, and MMA in 13%. The concentration of iAsIII in the aerosol condensate (median 3.27 μg/kg) was significantly higher than that in the e-liquid samples (median 1.08 μg/kg).
The presence of arsenic in e-liquids and aerosols raises health concerns, as arsenic is a known contaminant with potential health risks. The concentration of inorganic arsenic in the vaping air was approximately 3.4 μg/m3, approaching the permissible exposure limit (10 μg/m3) set by the United States Occupational Safety and Health Administration (OSHA). This level of exposure to inorganic arsenic in the vaping air may pose an increased risk of lung cancer over a lifetime of use.
While the specific health effects of arsenic exposure from e-cigarettes are not yet fully understood, the presence of arsenic in e-liquids and aerosols at levels nearing permissible exposure limits is concerning. Further research is needed to understand the potential health risks associated with arsenic exposure from e-cigarette use.
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Arsenic's impact on neurological health
Arsenic is a known human carcinogen, and its toxicity has been extensively studied. However, its impact on neurological health has been less understood until recently. More than 200 million people are exposed to arsenic worldwide, and arsenic toxicity affects almost every organ system in the body, including the brain.
Several epidemiological studies have shown a strong correlation between arsenic exposure and neurological and cognitive dysfunction in both children and adults. These deficits are dependent on the concentration, timing, and duration of exposure, with cumulative arsenic causing more severe consequences. Research in rodent models has provided evidence that arsenic toxicity affects multiple systems and specific pathways involved in learning, memory, movement, decision-making, and mood.
Animal and in vitro studies suggest that oxidative stress may be a mechanism of arsenic neurotoxicity. Prenatal and early postnatal exposure to arsenic have been linked to reduced brain weight, fewer glial cells and neurons, and alterations in neurotransmitter systems. Epidemiological studies also indicate that early life exposure is associated with deficits in intelligence and memory, and these effects may occur at exposure levels below current safety guidelines.
Additionally, arsenic exposure has been correlated with cognitive dysfunction and mental health issues. There is substantial evidence that arsenic exposure impairs cognition and increases the risk of mood disorders. Recent studies have also shown that even low concentrations of arsenic can impair neurological function, particularly in children, with potential cumulative effects on IQ and cognitive development.
While the specific mechanisms of arsenic's impact on neurological health are still being investigated, the available research clearly indicates that arsenic exposure has detrimental effects on brain function and cognitive development, particularly in early life and childhood.
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Arsenic's role in lung cancer risk
Arsenic is a well-known human carcinogen that has been linked to an increased risk of lung cancer. Arsenic-induced malignant transformation is mainly related to the biotransformation process intended for the metabolic clearing of the carcinogen, which results in specific genetic and epigenetic alterations that ultimately affect key pathways in lung carcinogenesis. The lungs are one of the main target organs for arsenic-related carcinogenesis.
The International Agency for Research on Cancer (IARC) classifies arsenic as a Group I carcinogen capable of inducing human malignant lung tumors. The most common type of lung cancer caused by arsenic exposure is squamous cell carcinoma. Arsenic-induced lung tumors exhibit particular features, such as squamous cell-type specificity and a high incidence among never-smokers.
Several studies have investigated the link between arsenic exposure and lung cancer risk. These studies have found a linear association between arsenic concentration in drinking water and logarithmically transformed lung cancer risk. The World Health Organization (WHO) has set a threshold value of 10 μg L–1 for arsenic in drinking water. However, there is still controversy among epidemiological studies on whether low to moderate arsenic concentrations possess any potential health threats.
In conclusion, arsenic exposure, whether through ingestion or inhalation, has been associated with an increased risk of lung cancer. The specific mechanisms of arsenic-induced lung cancer remain under investigation, but it is clear that arsenic plays a significant role in the development of this deadly disease. Further research is needed to fully understand the relationship between arsenic exposure and lung cancer risk, especially at low to moderate arsenic concentrations.
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Other harmful chemicals in e-cigarettes
E-cigarettes are handheld devices that produce an aerosolized mixture from a solution (i.e., e-liquid) containing nicotine, flavoring chemicals, vegetable glycerin (VG), and propylene glycol (PG). This mixture is inhaled by the user through a mouthpiece. While e-cigarettes are often considered a safer alternative to traditional cigarettes, they still contain harmful chemicals.
The heating element in e-cigarettes can cause the release of reactive aldehydes and carbonyls, as well as toxic flavoring chemicals, into the vapors. Certain flavoring chemicals, such as diacetyl and acetylpropionyl, are linked to "popcorn lung" disease and have been detected in milk-, butter-, fruit-, candy-, and cocktail-flavored e-liquids. Sweet, chocolate, and cinnamon flavorings have also shown cytotoxic effects, oxidative stress, and inflammation responses in several in vitro studies.
E-cigarette aerosol can contain harmful substances, including heavy metals such as nickel, cadmium, chromium, and lead. These metals can be present in the coil and leach into the e-liquid, especially at higher temperatures. The aerosolization of e-liquid leads to the emission of these toxic metals during vaping.
Furthermore, e-liquids may contain pharmacological components, such as weight-loss medications and erectile dysfunction drugs, which can have adverse health effects. The presence of these medicinal compounds places users at risk of experiencing undetermined health consequences.
The popularity of e-cigarettes, particularly among adolescents, teens, and young adults, is concerning due to the potential health risks associated with their use. While e-cigarettes may have fewer harmful chemicals than traditional cigarettes, they are not without dangers, and the long-term health effects of vaping are still unknown.
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Cardiovascular effects of e-cigarettes
While e-cigarettes are often considered a safer alternative to traditional cigarettes, they still introduce a host of chemicals into the lungs and can cause several health issues, including cardiovascular problems.
E-cigarettes, also known as vapes, contain nicotine, the addictive substance found in cigarettes, cigars, and other tobacco products. Nicotine is a health danger for pregnant women and developing fetuses, and can damage a fetus's developing brain and lungs. It is also harmful to adolescent brain development and can cause addiction in young people, affecting their attention, learning, mood, and impulse control.
Nicotine is an activator of the sympathetic nervous system, which has direct effects on the cardiovascular system. It binds to receptors in the nervous system and the adrenal medulla, triggering the release of catecholamines such as norepinephrine and epinephrine. This nicotine-stimulated catecholamine release activates receptors in the heart, resulting in increased heart rate, cardiac contractility, and workload. Long-term overstimulation of the sympathetic nervous system can lead to cardiac remodeling, promoting the development of heart failure and increasing the risk of arrhythmogenesis.
In addition to nicotine, e-cigarette aerosol can contain harmful substances such as diacetyl, formaldehyde, volatile organic compounds like benzene, heavy metals such as nickel, tin, and lead, and pesticides. These chemicals can cause lung damage and contribute to heart disease.
While the long-term effects of vaping are still being studied, early evidence suggests that it can have acute physiological effects, especially from electronic nicotine delivery systems. The heating elements of e-cigarettes can also release metals into the liquids and aerosols, and exposure to these metals has been linked to respiratory issues and potential cancer risks.
Therefore, while e-cigarettes may be considered a potential tobacco-cessation product, they still pose risks to cardiovascular health, particularly for youth and young adults who are increasingly taking up vaping.
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Frequently asked questions
Vaping is when you use a handheld electronic device to breathe a mist, or "vapour", into your lungs. An e-cigarette, vape pen or other electronic nicotine delivery system (ENDS) heats a liquid of nicotine, flavouring, propylene glycol and other additives into an aerosol that you inhale through a mouthpiece.
Vaping is often thought of as safer than cigarette smoking, but it still causes health problems. Both vaping and smoking are addictive and introduce potentially dangerous chemicals into your body. The particles you inhale while vaping can cause inflammation and irritation in your lungs, which can lead to lung damage. Other health risks include breathing problems, organ damage, addiction, and lung disease.
Yes, some ingredients in e-liquids are known to cause cancer. Vitamin E acetate, found in some e-liquids, is a possible cause of EVALI, a serious lung condition caused by vaping.
Several studies have reported the presence of arsenic in e-cigarettes. According to the Environmental Protection Agency, the estimated excess lung cancer risk from lifetime exposure to inorganic arsenic in e-cigarette vaping air is as high as 1.5 × 10^-4.
There is limited research on the health effects of e-cigarettes. However, inhaling other metals through vaping has been linked to permanent neurological disorders with symptoms including tremors, difficulty walking, and facial muscle spasms. While arsenic exposure has not been specifically linked to muscle twitching, it is a known carcinogen and can cause serious health issues.
