According to the article, how many chemicals are found in tobacco smoke on average, how many are known to be toxic, and how many have been linked to cancer?

Tobacco smoking is a dangerous act that can damage your lungs. This is because of the chemicals that are found in tobacco such as nicotine and carbon monoxide. In an article, it is said that there are 4000 chemicals all but 43 of them cause cancer. This is the main reason why smoking is cancerous.