does conan o'brien smoke cigarettes smokes pot on-air with Seth Rogen as late-night show comes to an end Conan O'Brien and Seth Rogen

Testing machines typically use short, shallow mouth-to-lung puffs

Vaping is a method of inhaling and exhaling vapor produced by an electronic device, commonly known as an e-cigarette

Sucralose looks a lot like table sugar, but the molecule trades three of sugars hydroxyl groups for chlorine atoms

Still, it was the Cigarette Smoking Man's big reveal in The X-Files revival that really took Mulder's family tree in a ridiculous (and disturbing) direction

While perhaps his time on the show ran a little too long (and there came a point where we wondered if this "devil incarnate" could ever really die), Davis' work as the Cigarette Smoking Man was career-defining