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
more than 7,000 chemicals in tobacco smoke, at least 250 are known to be harmful, including hydrogen cyanide, carbon monoxide, and ammonia (1, 2, 5). Among the 250 known harmful chemicals in tobacco smoke, at least 69 can cause cancer.
