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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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May 2014 Study finds e-cigarettes 60% more effective than gum or patches Study leader Professor Robert West, said: E-cigarettes could substantially improve public health because of their widespread appeal and the huge health gains associated with stopping smoking

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Here we focus on AR5 events (i.e