its a wake up call so decide now and quit it completely you can consult your family Dr. He may prescribe you few medicines in case you face problem due to sudden quitting.
Do not stress urself just take it each day as it comes drink lots of water try elaichi or clove when you get the urge to smoke avoid particular places typical food items friends do brisk walking.
Share with someone close to you as n when you feel the urge to smoke. Do not use any kind of substitution. Read books listen to nice music.
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