The first is, their positive effect on
the human system. Their peculiarity consists in so exciting the nervous
system that all the functions of the body are accelerated, and the
fluids are caused to move quicker than at their natural speed. This
increased motion of the animal fluids always produces an agreeable
effect on the mind. The intellect is invigorated, the imagination is
excited, the spirits are enlivened; and these effects are so agreeable
that all mankind, after having once experienced them, feel a great
desire for their repetition.
But this temporary invigoration of the system is always followed by
a diminution of the powers of the stimulated organs; so that, though
in all cases this reaction may not be perceptible, it is invariably
the result. It may be set down as the unchangeable rule of physiology,
that stimulating drinks deduct from the powers of the constitution in
exactly the proportion in which they operate to produce temporary
invigoration.
The second evil is the temptation which always attends the use of
stimulants. Their effect on the system is so agreeable, and the evils
resulting are so imperceptible and distant, that there is a constant
tendency to increase such excitement both in frequency and power.
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