It's clear that we have certain ideas of what smells mean, in general...
- Flowery means girls and/or happiness
- Coppery means blood. (Or pennies!)
- Stink means run away and/or admonish the smelly person in fault and/or decay.
In my universe, which I am starting far away from this one, I have a planet of humans. Regular humans. On a planet identical to earth. (So no "magic" answers.)
I want these people to associate the smell of lavender with violent, dirty, or otherwise 'wrong.' Whenever there is a crime or if for some reason someone wants to advertise a crime, they dump lavender oil in the area, and people know that something is bad. This has a multitude of purposes.
Question: How do you make (however you please, within the bounds,) a smell associated with wrong?