Absolutely, Sunny.
Smoking, drinking, drugs, eating, gambling, sex, exercise, housework, religious exaltation . . . all these activities and others can be used to "stuff" feelings.
I have no doubt that smoking--and exercise--helped Nicholas to sublimate his emotions, so that he might appear calm and affable. In fact, I would wager that "the traditional male" often has fallen back on these activities for the same purpose. After all, men are supposed to be rational beings, especially in contrast to emotional, dithery women. So it stands to reason that many men would need some sort of outlet to sublimate all those very human emotions such as anxiety and occasional despair. Smoking conveniently met that need.