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A 2017 study in Tobacco Control found that e-cigarette aerosol contains toxic substances that generate free radicals and oxidative stress

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Determination of Mainstream Tobacco Smoke pH Health Canada T-113 December 31, 1999 Table of Contents Scope of Applications Normative references Definitions Method Summary Apparatus and Equipment Reagents and Supplies Preparation of Glassware Preparation of Solutions Preparation of Standards Sampling Tobacco Product Preparation Smoking Machine, Electrode and pH Meter Preparation Sample Generation Sample Analysis Quality Control Modifications for Intense Smoking References Appendices 1 Scope of Applications This method is to be used to determine the pH of mainstream tobacco smoke on a puff-by-puff basis in order to observe the acid-base effects of mainstream smoke on an aqueous film during the smoking process

But this may not go far enough

According to the Nature survey, the most common reasons that people with Parkinsons disease use marijuana include managing chronic pain, anxiety, and sleeping difficulties

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