This is not of very common occurrence; but it is exceedingly troublesome when it does occur, and it takes a long time to get over it, even after the use of tobacco has been stopped entirely.
Sometimes it leads to permanent damage of the nerves and of the heart.
Give your heart plenty of vigorous exercise, but don't make it beat uncomfortably hard.

Give it plenty of food, sleep, and fresh air; _avoid poisoning it_, either with the toxins of diseases, or with your own waste-poisons, or alcohol, or tobacco; and it will serve you faithfully till a good old age..