asbestos in cigarette filters Cigarettes & Filters: 2 Terrible Things Worse Together Kent cigarettes, introduced in 1952

In Mauritius, asthma is also an important concern for respiratory health

E-cig fluid contains numerous chemicals known to be toxic to the respiratory system, such as carbonyl compounds, aldehydes, fine particulate matter, metals, propylene glycol, glycerol, formaldehyde, volatile organic compounds (VOCs), and flavoring chemicals 7,8,9,10,11,12,13,14,15,16,17 , and bacterial endotoxins and fungal glucans 18

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This would be difficult because of the reasons mentioned above, but would perhaps be feasible using a more flexible statistical model, or model-free analysis approaches such as Independent Components Analysis (ICA)