It’s good to make a disclaimer to anyone around you at work, family, etc. You will be more nervous and you cold act like an ass sometimes. You can bet on it.
Don’t take important decisions in the next month.
You will gain weight. Less smoke brings more food cravings. Try to compensate with walking.
Find something to fill your mouth. I used Liquorice root (helps me also with low blood pressure so it was a no brainer for me).
Keep on keeping on (cit.). You’ll have now and then desire, not need, desire to come back smoking. Compensate that with the thought of being free.
Good Luck mate.
I feel you. There’s only one antidote: time.