Smoking Alters Your Immune System for Years After You Quit

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 Institut Pasteur in Paris reports that smoking has a lingering effect on the immune system that persists long after taking your last drag.

The health of your immune system is defined by how well it responds to things. Like Goldilocks, the body prefers an immune response that’s not too big or too small, but just right: enough inflammation and antibodies to heal wounds and fight infections, but not so much that the body starts to attack

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