There is a chance the person using pepper spray inside might be affected. Cops use it often inside. As with any interaction with a bad guy, there is risk. Better than nothing, but imperfect. Shooting a gun inside is not risk free either.
I get that many posters here would prefer a gun and would recommend a gun for self defense/home defense. Personally a gun is my preferance as well. Each of us has to weight the risks and benefits of any self defense technique.
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