A good way to avoid the dust getting into your lungs and making you sick, is to wear a bandana while walking around the campsites. Didn't you ever notice your boogers were black? Some people aren't wearing a bandana just because they lost their face, they're wearing it to protect their health.
I second and third taking vitamins BEFORE, during, and after Roo. Hydrating yourself BEFORE, during, and after Roo. Some people are just more susceptible to getting sick, and that sucks.
With the trash, if you want to see less make sure you are doing your own part.
Puke and urine everywhere that I might sit/step in it? That happens on a daily basis at my local bar.