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Are they really doing this?

Yes.

https://en.wikipedia.org/wiki/List_of_additives_in_cigarette...

"According to the U.S. National Cancer Institute: "Of the more than 7,000 chemicals in tobacco smoke, at least 250 are known to be harmful, including hydrogen cyanide, carbon monoxide, and ammonia. Among the 250 known harmful chemicals in tobacco smoke, at least 69 can cause cancer."

https://en.wikipedia.org/wiki/List_of_additives_in_cigarette...

You got the right link, but the quoted excerpt is not responsive to GP's question.

The short answer is, "yes."

> This is the list of 599 additives in tobacco cigarettes submitted to the United States Department of Health and Human Services in April 1994.

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