I seriously doubt second hand smok can do very much out in the open, dilluted. This is why I mentioned car exhaust, since the attentant micro particle pollution is so much worse. There is no escape from that, inside or out. Although you can limit your exposure by staying in on bad days.
A smoker produces how many cubic metres of cigarette smoke an hour - and compared to a car. The ratio must be higher than 1-1000, and car exhaust doesn't take decades to kill you, hence the popular suicide method.