Return to Smoking & Vaping 8 Hours After Quitting 8 Hours After Quitting 48 Hours After Quitting 72 Hours After Quitting 2 Weeks to 3 Months After Quitting 6 Months After Quitting 1 Year After Quitting 10 Years After Quitting 15 Years After Quitting More Good Reasons Some positive effects you may feel within the first 8 hours of quitting smoking are: carbon monoxide level drops in your body. oxygen level in your blood increases to normal.
