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I know precisely what you are talking about. I'll explain this in two parts-
1 - getting intoxicated on cannabis is like a plateau - One gets only so high on cannabis and consuming more of it does not get one higher. Actually coming down on the back side of the plateau is pleasant in it's own way.
2 - The majority of cannabis users do not "stay high all day". It is quite normal for cannabis users to be "straight" the majority of the time. It is recognizable that being intoxicated is not the condition to be in while carrying out the many ordinary tasks in life.
Armageddon, AK-47, White Widow.