It takes longer than 72 hours to clear out nicotine from the body. 4 days for the saliva but upto a year it can be measured in hair samples. Not counting the

It takes longer than 72 hours to clear out nicotine from the body. 4 days for the saliva but upto a year it can be measured in hair samples. Not counting the repair/reorganization the body requires to function again. 28 days is probably a good measure.