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While the Centre for Disease Control and Prevention (CDC) stopped short of conclusively identifying THC products as the main cause, it could offer an explanation as to why victims who had only been vaping it for a short time died, while others have been doing it for years around the world without issue
(b) methodological differences such as prospective or retrospective study design, definition and classification of smoking habits (active smoker, never smokers, ex-smokers), quantification of exposure (pack years, duration of cigarette smoking) classification of CKD (proteinuria, serum creatinine levels, eGFR), duration of follow-up after cessation of smoking, presence of comorbidities, life style, health care system, and medications
Each condition performed twice