Yes, it is normal. It has probably something to do with the way how brain responds to nicotine and how nicotine (and its absence) influence the brain. Mental work (or stress) makes the brain need it.
I have observed the same thing on myself many times - the more I have to concentrate on something mentally or the more stress I have to face, the more I usually smoke at that time.
Is it normal that I have the urge to smoke when I study
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Yes, it is normal. It has probably something to do with the way how brain responds to nicotine and how nicotine (and its absence) influence the brain. Mental work (or stress) makes the brain need it.
I have observed the same thing on myself many times - the more I have to concentrate on something mentally or the more stress I have to face, the more I usually smoke at that time.