When you quit smoking, the benefits begin within minutes of your last cigarette.
At 20 minutes after quitting:
Blood pressure decreases.
Pulse rate drops.
Body temperature of hands and feet increases.
At 8 hours:
Carbon monoxide level in blood drops to normal.
Oxygen level in blood increases to normal.
At 24 hours:
Chance of a heart attack decreases.
At 48 hours:
Nerve endings start to regrow.
Ability to smell and taste improves.