are cigarettes or weed worse for lungs Smoking marijuana can raise risk of lung disease, chest scans indicate The Effects of Smoking Cannabis
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Inhaling burnt tobacco - but also chewing it - is hugely damaging to human health

it compromises the responses of the bronchial epithelium by modifying the expression and activation of innate immunity receptors and determines the destruction of desmosomes and tight junctions with increased permeability to allergens, pollutants, and infectious agents and the release of inflammatory mediators (IL-8, IL-1, sICAM-1) 15

He turns up singing on a different sitcom, The Ghost and Mrs

Of course, thats much easier said than done
Stay away from environments where smoking is common or around people who smoke
