Tobacco contains a lot of ingredients, but many people focus on the ones that cause damage such as nicotine, tar, and carbon monoxide.

Nicotine:

Drugs in tobacco smoke that makes openings of blood vessels smaller than they should be.

Tar:

Sticky brown substance in tobacco in smoke that coats the inside of the windpipe.

Carbon Monoxide:

Gas in tobacco smoke that takes the place of oxygen in a smoker’s blood.

The above ingredients cause Lung Cancer and Disease.

This information was gathered at:
Tobacco Facts
Youth No Smoke