You have done a great job by quitting smoking as you already must be knowing about the various helath hazards caused by it.
Provided you have a Nicotine dependence, withdrawal symptoms after stopping smoking can develop within 2 hours of smoking and may persist for weeks or months.
Common symptoms include an intense craving for nicotine,irritability,difficulty concentrating,drowsiness etc.Symptoms
There are Nicotine replacement therapies available which help in nicotine cessation probably because they reduce withdrawal.
You may discuss with your doctor about these options -
Other option is of Nonnicotine medicines - Drug such as Buproprion and Clonidine, Varenicline a new drugTreatments and drugs
Another option is Behavior therapy which is also a widely accepted and well proven method.
I hope it helps.
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