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Menthol has been used in cigarettes for decades

Image Credit: Fongbeerredhot / Shutterstock Tobacco and Immunity Although carcinogens within tobacco and cigarettes are to blame for the increased risk of cancer, numerous other compounds act as pro-inflammatory and immunosuppressive agents, including nicotine, formaldehyde, ammonia, carbon monoxide, benzopyrenes, tar, acetone, hydroxyquinone, cadmium and nitrogen oxides

Chopra GS, Jandu BS (1976) Psychoclinical effects of long-term marijuana use in 275 Indian chronic users

Low testosterone can lead to various physical manifestations in the body

Their placebo effect is going to tell them it isn't going to be functional, which may impact the results