stress and drinking/smoking

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why do people tend to drink or smoke after a very stressful day at work? could it be because of psychological reasons (need for a 'comfort zone')? or could it be due to physiological reasons (physiological craving for a stimulant or relaxant)? i myself have been wondering about this because when i'm stressed at work, especially with my nasty boss, i tend to succumb to invitations by co-workers for a night of drinking beer or hard drinks and smoking. hopefully i get the chance to relieve stress in less harmful ways.