1. Health damage Facemasks in the COVID-19 era: A health hypothesis https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7680614/#b0125 1.1. Hypoxemia & Hypercapnia Hypoxemia and hypoxia are decreased levels of oxygen (deoxygenation) in the blood. Hypercapnia is an increased level of CO2 in the blood. Both are harmful to our health and can be deadly if taken too far. Preliminary report on surgical mask induced deoxygenation during major surgery. https://web.archive.org/save/https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7680614/#b0125 The physiological impact of wearing an N95 mask during hemodialysis as a precaution against SARS in patients with end-stage renal disease. https://pubmed.ncbi.nlm.nih.gov/18500410/ The Physiological Impact of N95 Masks on Medical Staff. https://pubmed.ncbi.nlm.nih.gov/15340662/ N95 Respirators vs Medical Masks for Preventing Influenza Among Health Care Personnel: A Randomized Clinical Trial. https://clinicaltrials.gov/ct2/show/NCT00173017/ 1.2. Increase in clinical disease and influenza-like illness CI stands for clinical illness and ILI for influenza-like illness. A cluster randomized trial of cloth masks compared with medical masks in healthcare workers. https://pubmed.ncbi.nlm.nih.gov/31479137/ 1.3. Bacterial and fungal pneumonia The moist mask environment is a perfect breeding ground for bacteria and fungi that are inhaled and cause lung infections. Predominant Role of Bacterial Pneumonia as a Cause of Death in Pandemic Influenza: Implications for Pandemic Influenza Preparedness https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4420971/ N95 Respirators vs Medical Masks for Preventing Influenza Among Health Care Personnel: A Randomized Clinical Trial. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2599911/ 2. Effectiveness Andrew Kaufman's video analysis of the Danish mask study: Effectiveness of Adding a Mask Recommendation to Other Public Health Measures to Prevent SARS-CoV-2 Infection in Danish Mask Wearers https://jamanetwork.com/journals/jama/fullarticle/2749214 Why Face Masks Don't Work: A Revealing Review https://wickedtruths.org/wp-content/uploads/2021/03/JAMA-Vol73issue5-1919-ROSENAU-MILTON-J.-EXPERIMENTS-TO-DETERMINE-MODE-OF-SPREAD-OF-INFLUENZA.pdf Cluster randomized controlled trial to examine medical mask use as source control for people with respiratory illness. https://www.bitchute.com/video/BWth30LdrvEg/ The use of masks and respirators to prevent transmission of influenza: a systematic review of the scientific evidence. https://www.acpjournals.org/doi/10.7326/M20-6817 Evaluating the efficacy of cloth facemasks in reducing particulate matter exposure. https://archive.is/ZN924 Facemasks for the prevention of infection in healthcare and community settings. https://web.archive.org/web/20200618031535/https://www.oralhealthgroup.com/features/face-masks-dont-work-revealing-review/ Evaluating the efficacy of cloth facemasks in reducing particulate matter exposure. https://pubmed.ncbi.nlm.nih.gov/28039289/ Respiratory virus shedding in exhaled breath and efficacy of face masks. https://pubmed.ncbi.nlm.nih.gov/22188875/ Use of surgical face masks to reduce the incidence of the common cold among health care workers in Japan: a randomized controlled trial. https://pubmed.ncbi.nlm.nih.gov/27531371/ Effectiveness of N95 respirators versus surgical masks in protecting health care workers from acute respiratory infection. https://pubmed.ncbi.nlm.nih.gov/25858901/ Effectiveness of Masks and Respirators Against Respiratory Infections in Healthcare Workers: A Systematic Review and Meta-Analysis. https://pubmed.ncbi.nlm.nih.gov/27531371/ 3. More resources Are Face Masks Effective? The Evidence https://swprs.org/face-masks-evidence/