However, marijuana that is smoked is often unfiltered, which can potentially lead to more damaging particles entering the airways and lungs. Combined marijuana and cigarette smokers were three to four times more likely to have airway wall thickening, which can lead to infections, scarring, and further airway damage
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This action is further reinforcement that authorization of an e-cigarette product is possible when sufficient scientific evidence has been submitted to the agency to justify it. Evaluating PMTAs Based on Public Health Standards The FDA evaluates PMTAs based on a public health standard that considers, among other factors, the risks and benefits of the product to the population as a whole
Instead, much of the research around vaping has only indicated that vapor inhaled into the lungs of e-cigarette users contain some known carcinogens and have been shown to damage the DNA of a users cells - one of the precursors to cancer
