I did this last year! It is so much fun and at least half of the people walked. Those with trouble breathing, I saw many people using bandanna's or masks over their mouths. My mom used a bandanna because she has permanent lung damage and she was fine. My husband has asthma and he was fine without using anything. The powder is only really bad at the color zones and you can go through them quickly if you need to. But of course use your own discretion, I would not recommend it for those with severe respiratory issues. Or a corn allergy (it is corn powder with food dye).