He was an especially zealous campaigner against masturbation; this was an orthodox view during his lifetime, especially the earlier part. Kellogg was able to draw upon many medical sources' claims such as "neither the plague, nor war, nor small-pox, nor similar diseases, have produced results so disastrous to humanity as the pernicious habit of onanism," credited to one Dr. Adam Clarke. Kellogg strongly warned against the habit in his own words, claiming of masturbation-related deaths "such a victim literally dies by his own hand," among other condemnations. He felt that masturbation destroyed not only physical and mental health, but the moral health of individuals as well. Kellogg also believed the practice of "solitary-vice" caused cancer of the womb, urinary diseases, nocturnal emissions, impotence, epilepsy, insanity, and mental and physical debility ? "dimness of vision" was only briefly mentioned.