Does your baby get upset by smells?

I wanted to see if this has happened to any one else. My 4 1/2 month old has only been to my mom's house twice, but both times she has screamed her head off and it's a cry we never hear otherwise. Our baby is the best and only cries when she's hungry or tired, so this fussing is very strange to us. My mom is a smoker and of course doesn't smoke while our daughter is there, but her house of course has that smell - even though when you walk in you would never know they are smokers because they cover it up with other scents such as candles. She doesn't start crying right away when she is there, but after about 15 min. it will set in a doesn't stop until after we leave. She's only done this one other place other than my mom's and it was at my sister-in-law's that was burning a fire in the fireplace and also had candles going. So I started to think she was getting upset by the smells. I asked the pediatrician about it and he said that it could be it and she could be just as scared of smells as she is any physical thing. But of course my mom and step-father won't listen that that is what it is. Can any one else help me out here in proving that is what it is? They try to tell me that it's because I feed her as soon as we get there. I think my reasoning makes a little more sense! I know mother knows best, but try telling your own mother that! :)