Researchers used a robotic system that mimics human breathing. They measured the number and size of toxic particles produced by the evaporation of various liquids. It turns out that menthol liquids produce more microparticles that can enter the lungs and cause inflammation.
In addition, the scientists analyzed data from patients who smoke. They found that those who drank menthol liquids had poorer lung function. This was independent of other factors such as age, gender, smoking history or nicotine content.
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