Hi. I appreciate your effort towards deaddiction. More than 1 million people die due to tobacco related addictions every year in India.
I understand that your habit of smoking is not only chronic but quite severe considering the per day counts.
20 cigs / day means that the habit has gripped you not only emotionally but also physically - i.e. the frequent hand to mouth movements which happen while you smoke is also a part of the habit now.
Together they lead to the strong craving.
Next Steps
It is advisable to meet a Deaddiction Psychiatrist (Allopathic / Homoeopathic), who will prescribe certain medicines to help the craving.
Health Tips
Choose 3 activities to replace the hand to mouth movement habit, at the time of craving. eg: sipping on water or any fluid, eating a fruit, keeping your hands busy with a pen or pencil, chewing gum or chocolate, calling up someone over phone. Best Luck.