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Particulate matter air pollution exposure: role in the development and exacerbation of chronic obstructive pulmonary disease

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However, due to the small number of studies and lack of data on long-term nicotine-containing electronic cigarette usage usage over more than two years questions remain about long-term effects. The researchers conclude that more evidence, particularly about the effects of newer e-cigarettes with better nicotine delivery than earlier ones, is needed to assist more people quit smoking

Behavioral Conditioning: Smoking becomes associated with daily routines, social interactions, and specific triggers (e.g., after meals, with coffee), strengthening psychological dependence