Bear spray affects humans much like it does bears. The red pepper derivatives can cause swelling and irritation of the eyes, nose, and lungs. If you get sprayed in the face, you may not be able to open your eyes, have an extreme case of a runny nose, and experience a coughing fit. It's painful, but the effects are temporary if treated properly. If you are sprayed, wash all affected areas with cool, clean water, remove contact lenses, and wash contaminated clothing immediately. Take short shallow breaths to avoid inhaling the spray. It will likely take at least 15 to 20 minutes before you experience any relief. If symptoms persist, seek medical attention.