A bad habit when someone are walking

Every day I walk to subway station from my company to go back home,or walk to the subway station from home , there was one or two smokers walking in front of me, and the smoke just flow into my nose. Because I am a non-smoker ,so I feel really annoying. So I walked quicker to surpass him or them to avoid the smoke ...But the desperate fact is that when I surpassed one smoker ,there was another smoker walking in front of me. It seems there are so many smokers started to smoke on the way to the subway station. There are several crossroads on the way to subway station and it means when we all waited for the green light ,all the smokers make the smoke to the crowd so freely.
I mean this occurred in Beijing ,where people's educational levels are relatively high , and in my hometown which is a small city ,even smoking indoor or public building is very common. I am so angry about this kind of bad behavior.