Why would I need "studies", when I *know* for a *fact* that your smoke gets to me? It's quite obvious, really: I *know* for a *fact* that your smoke gets into my clothes and makes them stink, irritates my eyes so they get red and run and hurt, and gets on my skin and in my hair so *I* stink.
Actually, even without evidence of carcenogenic effects of second-hand smoke, this in and of itself makes smoking in the presence of a non-smoker impolite at best. At worst, even without carcenogenic effects, it can be hazardous to people with other breathing ailments or smoke-related sensitivity. I'm not normally hypersensitive to cigarette smoke, but if I have a cold the stuff increases my misery considerably. Someone with more severe ailments like bronchitis might even find it life-threatening.
Back in the late 70's and early 80's, when I was pretty active in tournament chess, I could go to a chess tournament, play games in a smoke-filled room, and smell smoke for a week. (It clings to the fine hairs inside your nose, making it next to impossible even to wash the stink out.)