Can someone smelling like cigarette smoke harm a newborn baby ?

TES
I wanted to have my mom stay over to help out after I have the baby. I also have a one year old , but she is a smoker and her clothes linger of smoke. Would that be harmful to my newborn baby ?? At five days old my one year old caught RSV and I kind of blame my mom coming over for it because she smokes cigarettes and was coughing. Am I being dramatic , I just don't want my baby to get sick