Unnatural stimulants and narcotics cause physical degeneration and provoke a rebound reaction of exhaustion.

Original passage

Under the head of stimulants and narcotics is classed a great variety of articles that, altogether used as food or drink, irritate the stomach, poison the blood, and excite the nerves. Their use is a positive evil. Men seek the excitement of stimulants, because, for the time, the results are agreeable. But there is always a reaction. The use of unnatural stimulants always tends to excess, and it is an active agent in promoting physical degeneration and decay.