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MONTREAL, Quebec — While previous studies have shown that vaping is harmful, one flavor of e-cigarette stands out as the worst of them all. Scientists in Canada have found that berry-flavored vapes are the most damaging to the lungs compared to unflavored e-cigarettes.
Specifically, researchers believe the flavor weakens the lungs’ natural defenses, making it more difficult for the body to stop dangerous germs.
“We need to be careful about the types of flavors that we’re including in these products. They can have detrimental effects,” says study co-author Ajitha Thanabalasuriar, an assistant professor in the Department of Pharmacology & Therapeutics at McGill University, in a media release. “I think that’s really the take-home message, especially some of these vaping products that are marketed for kids — the way they’re sold, the type of containers they are sold in — it’s very colorful, it’s really attractive to children, and this can be a really bad thing for our future.”
The animal study, published in the journal PNAS, involved mice exposed to flavored and unflavored e-cigarette vapor for several days. The researchers used a live imaging technique to examine the change in lung immune cells in real time.
Previous research suggested that all vaping types are harmful, with certain flavored vapes being the most dangerous. However, the current study found berry vapes were the most damaging.
Immune cells, known as alveolar macrophages, use specialized cell pathways to move along the lungs and remove harmful particles in the lower respiratory tract. When inhaling berry-flavored vapor, the researchers found it contained additional chemicals that stopped the expression of these cellular pathways.
As a result, alveolar macrophages were paralyzed, and their immune behavior shifted from squeezing to probing bacteria. The weakened immune response to inhaled bacteria, such as Pseudomonas aeruginosa decreased the survival rate of mice.
The next step of the research is to identify the specific chemical compounds in berry-flavored vapes responsible for impairing immune cells. The researchers also need to ensure that the same effects they’ve seen in mice are happening in human lungs.
Paper Summary
Methodology
The study used a controlled experiment to assess how berry-flavored e-cigarette vapor impacts alveolar macrophages (AMs), which are essential immune cells in the lungs responsible for fighting off infections. Researchers exposed mice to berry-flavored e-cig vapor over several days, using a whole-body exposure system to simulate consistent inhalation. They then stained the AMs to visualize movement patterns through advanced microscopy and analyzed protein expressions via proteomics. By comparing treated mice with control groups exposed only to air, they could identify changes in AM mobility, actin structure, and response to bacterial infection.
Key Results
The study found that exposure to berry-flavored e-cigarette vapor significantly reduced the mobility of AMs. Instead of moving through alveoli to clear bacteria, AMs in exposed mice showed decreased “squeezing” behavior and increased “probing,” meaning they extended but did not relocate effectively. This change reduced their ability to remove bacteria from the lungs, increasing bacterial survival and, consequently, health risks in the respiratory system. Notably, specific proteins related to cell movement, such as CDC42, were downregulated, affecting the AMs’ ability to move and respond to infections effectively.
Study Limitations
While this study offers valuable insights, it primarily used animal models, which may not fully replicate human responses to e-cigarette exposure. Additionally, the study focused on a single flavor (berry) and did not explore long-term effects or the potential impact of other flavors. Further research is needed to assess if these findings apply across different e-cigarette flavors and human demographics.
Discussion & Takeaways
The findings highlight potential risks associated with flavored e-cigarette products. AMs, which play a crucial role in respiratory immunity, are impaired in their ability to move and fight infections after exposure to berry-flavored e-cig vapor. This suggests that flavored e-cigarettes could pose a unique threat to lung health by weakening the immune system’s frontline defenses. For public health, this study underlines the importance of reconsidering the safety of flavored e-cigarette products, especially for younger users who may be more attracted to these flavors.
Funding & Disclosures
The study was conducted with the support of institutional grants. The authors declared no competing interests, ensuring the study’s findings are impartial and focused on advancing scientific knowledge about the effects of e-cigarettes on lung health.
