Effects of Tobacco on the Brain and Nerves.~--The effects of tobacco upon the brain and nerves are much the same as those of alcohol.
Tobacco, like alcohol, is a narcotic.

It benumbs and paralyzes the nerves, and it is by this means that it obtains such an influence over those who use it.
~18.~ The hand of a man or boy who uses tobacco often becomes so unsteady that he can scarcely write.

Do you know what makes it so unsteady?
It is because the cells which send nerves to the muscles of the hand are diseased.

When a person has a trembling hand you say he is nervous.

If you feel his pulse you will find that it does not beat steadily and regularly as it ought to do.