This section is from the book "The Hygienic System: Fasting And Sun Bathing", by Herbert M. Shelton. Also available from Amazon: The Hygienic System Vol III Fasting and Sun Bathing.
It should not be necessary to devote space to coffee, tea, chocolate and cocoa addiction. These poisonous substances (caffeine-containing drugs) are used by many millions of people for the same reasons that tobacco and alcohol are employed--to "relieve" distress. Caffeine is classed as a stimulant and is commonly employed by the enervated and weak to "sustain" them in their work or to keep them awake at night. Stimulation is wasteful of the energy of life, producing enervation. The headache, nervousness, unease, and suffering of the caffeine addict drives him, or her, to more of the same poison that produced his, or her enervation in the first place.