Thanks, Mr. Camel Dear Mr. Camel, Tobacco smoke contains hundreds of damaging chemical substances. Smoke from an unfiltered cigarette contains about 5 billion particles per cubic millimeter. These particles, when condensed, form the brown, sticky mass called cigarette tar. Some chemicals in tobacco tar are linked to the development of cancer.
Tobacco also contains poisonous substances, including arsenic.
In addition to being an addictive psychoactive drug, nicotine is also a poison and can be fatal in high doses.