I feel like the general population would benefit by understanding how different things effect our emotions in different ways.
Lighting, music, exercise, what we eat, different smells, etc.
I occasionally will use these things to "set the mood". I don't (always) mean that romantically. If I'm trying to focus (work mostly), or get hyped up for something, or to get ready to sleep. But the bigger issue is when we're being manipulated by outside sources to achieve some goal. Any time you're being sold something, there's an effort to manipulate your emotions.