Effects of Cocaine and Morphine Withdrawal on the Immune Response -- Biological Links between Cannabinoids and HIV Infection -- Cannabinoids and Herpesviruses -- Cannabinoids and Susceptibility to Neurological Infection by Free-Living Amebae -- Legionella Infection and Cannabinoids -- Nicotine and Immunity -- Nicotine Receptors and Infections -- Immunomodulatory Effects of Cigarette Smoke/Nicot…