The heart is nervous and trembles just the same as the muscles do.

This shows that the tobacco has poisoned the cells in the brain which regulate the heart.
~19.~ Wise physicians will tell you that one reason why tobacco is bad for boys is that it hurts their brains so that they cannot learn well, and do not become as useful and successful men as they might be.
~20.~ Students in the naval and military schools of this country are not allowed to use tobacco on account of its bad effects upon the mind.

In France the use of tobacco is forbidden to all students in the public schools.
~21.

Tobacco Leads to Vice.~--Boys who use tobacco are more liable to get into company with boys who have other bad habits, and so are apt to become bad in many other ways.

The use of tobacco often makes men want strong drink, and thus leads to drunkenness.