Does being around Marijuana Smoke have any Side Effects?

I often go to rock concerts and people always light up during the shows. There’s always a lot of marijuana smoke floating all around and inhaling it is really unavoidable. So I was wondering if there would be any side effects to inhaling a lot of the smoke. I’m guessing it’s nothing as severe as actually smoking the stuff, but I don’t want any drug damaged brain cells. Any help?

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