i share the same situation, except that i am not pregnant...an officemate & I use the same room/office,as soon as i see him reaching for his lighter to start smoking, i stand up, take my mobile phone, my water/cup of coffee and leave, i sit somewhere else and i don't get intimidated if any of the higher management sees me...i simply say -"he's" smoking again and i won't allow myself to get sick cuz of that.