How tear gas and pepper spray affect the body, and what to do if you've been hit

• Tear gas and pepper spray are being deployed on protesters around the country.
• The products are generally safe, but can prompt asthma attacks, coughing, and sneezing, which can all spread viruses around.
• The best thing to do if you're hit by tear gas or pepper spray is to pour lots of water on the injury and seek fresh air. 
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Tear gas and pepper spray have both been used to quell crowds over the past week...