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The EPA has identified over 100 types of viruses that can live in sewage for weeks, making it especially dangerous for children, older adults, and those who are immunosuppressed

Mortimer PS, Dawber RPR, Gales MA, Moore RA

Retrieved 22 July 2020

In order to translate observed breathing patterns and smoking behavior into biological effects, we combined the small airway-on-a-chip with a smoking machine that burns cigarettes and a microrespirator that inhales and exhales small volumes of cigarette smoke and fresh air in and out of the epithelium-lined channel in programmable intervals mimicking true smoking behavior, said Richard Novak, a co-author of the study and a senior staff engineer at the Wyss Institute, who helped design the smoking instrument