[14] A 2025 BMJ Open study of a 2019 door-to-door survey of people aged 18-24 found weighted current-use prevalence of 10.1% for cigarettes, 5.1% for HTPs and 1.8% for e-cigarettes, with 68.2% of current HTP users also using cigarettes
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In response to injury, bone marrow monocytes also migrate to the lungs and differentiate into macrophages to restore the alveolar macrophage pool