I don't think they've found any risks for outdoor exposure. The amount of exposure you get in a smoking bar is far more than what you get outside. Also there

I don't think they've found any risks for outdoor exposure. The amount of exposure you get in a smoking bar is far more than what you get outside. Also there is some weirdness in the research where it's hard to find a dose response curve, and you see larger effects on cardiovascular system than lungs. I think there might be some confounds, like if you are married to a smoker or work at smoking establishment you're more likely to be poor, and be unhealthy in other ways besides smoke exposure.