cigarettes cause lung cancer how does smoking The idea that only smokers can get lung cancer How Do Cigarettes Cause Cancer?
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They self seeded too

What will happen to me and my family if I keep smoking

10.1371/journal.pmed.1001611 PLoS Med

The primary components of cigarette smoke are nicotine, tar, carbon monoxide, formaldehyde, benzene, and various carcinogens

Later episodes of The X-Files confirm that the Cigarette Smoking Man has had many aliases over the years, so it makes perfect sense that he would pose as a CIA agent in Young At Heart. The research the agent was after could have changed the entire world, and it might have even helped our favorite shadowy government operatives in their private resistance against the aliens

According to researchers at Queen Marys Wolfson Institute of Preventative Medicine, at least three out of five people who try a cigarette for the first time become daily smokers