text: how longbefore the nicotine is out of your body?   nicotine leaves the body in 2-3 days  ...  typically if you can make it a year without smoking then you've 90% quit for life.  20 minutes: blood pressure decreases-pulse rate drops-body temperature of hands and feet increases.  8 hours: carbon monoxide level in blood drops to normal-oxygen level in blood increases to normal    24 hours: chance of a heart attack decreases.  48 hours: nerve endings start regrowing-sense of smell and sense of taste improve   2 to 3 weeks: circulation improves-walking becomes easier-lung function improves.