No, the mood of the subject should generally be improved. Like if you eat a piece of chocolate, the enzymes or whatever make you happy for a bit, but it doesn't mean you crash and feel bad later! It's like that only not with enzymes. And a little stronger reaction.

I mean, sooner or later they'll probably be sad. We were all just forced to participate in a war and kill people, and yet we weren't able to save any civilians. [A wince.] I can't fix that. That's just how it is. But I can take people's mind off it for awhile.