smoking : how come some say it helps when you study?

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most of the people is see in my school, a med. school, are smoking. i asked my friends about it and some said that it helps in studying? well, it actually reduces the stress they said. knowing that in a medical school stress really is the number one problem of the students. so, is it true that it helps you manage your stress? although, whatever the answer is, i still am not changing my stand for cigars, its still a no-no for me.