Smoking and cussing.

Okay. So my husbands side of the family are smokers. I know I'm not letting them smoke around our baby but should I ask them not to smoke before they see the baby? The smell of smoke on people's clothes makes me sick to my stomach. But do I have that right? I feel like they are grown adults and they can do what they want. 
Same goes for cussing. Hearing it from loved ones really makes me cringe. But again, I feel like I shouldn't tell them what to do. And yes, I know that our baby will hear it eventually, I just don't want it to be from loved ones. 
I love his family so much and my family. 
What do you think? Am I being unreasonable? Please no negative comments. Thank you. ❤