Some don't respect, while some actually do; it's a thing of personality. I have met some smokers who, before they smoke, will ask you a question if you are comfortable with it or not, and if you are not, they can quietly move to somewhere they can do it. There are also some who smoke even while walking on the street; they don't even care about who is not comfortable with it and who is. It's not all smokers who don't respect others space.