It’s 2024—we know that cigarettes are bad for you. But scientists are still uncovering new and troubling ways that smoking changes you from the inside out. Today in Nature, a new study from the ...

Nicotine itself could clear from your body in a few hours, but its byproduct can linger for days or weeks. Most nicotine tests detect cotinine, which can show up in urine, saliva, blood, hair, and ...

Nicotine pouches—small, flavored packets placed between the gums and lips—have recently become an increasingly appealing option for people trying to avoid cigarettes and traditional “smokeless” oral ...

As it does with other pathogens, your immune system sees drugs as foreign invaders to be expelled from your body. But ...