While I won't get into the controversy of whether rescue organizations should deny healthy dogs to people who smoke, ( at times rescue groups can seem to be a tad, shall we say, overzealous), I don't think that there is any question that cigarette smoking can be harmful to our pets. Not to step on toes, but the 'they don't live that long' argument is , to say the least, unconvincing.
I will see dogs come in for respiratory issues, and when I part their hairs and sniff the skin I start to gag and my eyes water because they reek of cigarette smoke. Sometimes I can hardly be in the exam room with them. I have seen Bichons who are yellow, Westies that look like Cairns, and when you pet them you might as well be wiping an ash tray.
No, I can't quote a study, but i can not believe that this would not be a serious problem for the respiratory system, and would not aggravate the very serious and very common allergic bronchitis, chronic bronchitis, tracheal collapse etc. which we treat every day. - Dr. Mac