do cigarette companies still make money How the tobacco industry is renewing its assault on science Cigarette Companies Are Caught Between

They have a symbiotic relationship with the harmful bacteria living in their guts

Thus, smokers who reduced their use of regular cigarettes in favor of vaping may have lost some of the hypothesized protective effect afforded by CO, which could have increased their risk of developing autoimmunity

Microbial and Mycotoxin Contamination in Packaged and Unpackaged Smokeless Tobacco and Non-tobacco Chewing Products in India Shakila Mahesh, Meena Jain, Roomani Srivastava, Adeeba Saleem Journal of International Society of Preventive and Community Dentistry 29

SmokeHaz: Systematic Reviews and Meta-analyses of the Effects of Smoking on Respiratory Health