Second hand smoke and distance running?

I run alot, like 30 miles a week, and I was wondering if hanging out with my friends who smoke would really do anything. It's usually in a house, with someone sitting several feet away and smoking. I'm not usually right in the middle of the cloud, just in a different room or in a corner, and usually only there for a few minutes. So maybe a couple hours a week in a slightly smoky environment, its something I try to avoid but would it really do anything? I don't want to completely stop visiting them.