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my bad! Yes, as you said, there are no new users when you su to root and then su to user. But when you do that, the root acount is still there. If you check with:
you will see, that there are 3 processes running shell, but it should be only one, since it should return you where you started from. And I have noticed a similar discussion, where unSpawn said, that this must be taken as a serious security risk.
So ... yes, there are no more users, but to exit from root account you MUST use exit and not just su to normal user.