The smoking thread got me thinking, how do you react when people engage in their own personal habits that impact other people?

Examples:
-Smoking
-Extremely loud music in the car with the windows down during bumper to bumper traffic or in a parking lot,
-Going to a public place with extreme body odor

Do these things bother you or do you just ignore them? What kind of things bother you the most? What are some other examples that I'm forgetting?