This video has been out for a couple years but like most of his work, it still contains good info
As nicotine levels drop, symptoms such as restlessness, low mood, and anxiety re-emerge, reinforcing the cycle of dependence. Beyond psychological explanations, nicotines interaction with the hypothalamicpituitaryadrenal (HPA) axis, which regulates the stress response, provides a biological basis for its effects on mood
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That said, the duration of nicotine withdrawal symptoms varies from person to person
These will be fully closed from view before the April 2015 compliance date. World Duty Free said this phased approach south of the Border would help customers get used to the changes suggesting it could lose out from the more rapid shift in Scotland