Heart

When people smoke, poison from the cigarette gets into the blood
stream and makes it harder for the blood to carry oxygen around the
body. We need this oxygen to be carried around the body to be
healthy and to stay alive.

Because it’s like the blood is dirty the heart – which is
pumping blood around the body – has to work extra hard, and it gets
tired and weak. This is how smoking leads to heart disease and
heart attack.