That brownish-black mess is called tar and no, its not something added to your cannabis or tobacco
Asbestosisnot asbestos exposurehas been invoked as the primary risk factor for lung cancer as recently as 2014 [38], and Cagle [51] commented that Unless and until a better marker comes along, the only consistently reliable marker for an asbestos-related lung cancer is asbestosis, especially in asbestos workers who are also tobacco smokers. We consider that in some instances, a clinical-radiologic diagnosis of early/mild asbestosis cannot be made with consistency or reliability, and may be the subject of dispute among respiratory physicians and radiologists, because of the following disagreements: Dispute as to whether there is genuine interstitial fibrosis, even in high-resolution CT scans [132], or whether any changes are related to associated pleural fibrosis
in areas with limited accessibility, reduced cleaning efficiency leads to greater pollutant retention and consequently higher CBPI values 2,35
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According to the survey, the prevalence of tobacco use among both sexes accounted for 9.1 per cent of the population 15.7 per cent and 2.4 per cent for men and women, respectively