Am I wrong? What would you do in this situation?

Before I even became pregnant I had it set in my mind that nobody who smokes will come around me or my baby. My little brother died from SIDS and one cause of that is second hand smoke(his dad smoked but we aren’t certain that’s what caused it). I made it clear to both my sister and mother in law that if they kept smoking they just wouldn’t be around me or the baby. My sister agreed. My mother in law however made a big deal about it. It’s her life and she can choose what she wants to do but she can’t be mad at me for doing what I think is best for me and the baby. She made a comment saying how I shouldn’t keep the baby from her because of that. She smokes inside her house..you can walk in and not even be in there for 5 minutes and come out with everything you got on smelling like smoke. I haven’t been to her house since I found out and she’s continued to smoke. Even had the nerve to ask my husband to get her cigarettes. My husband agrees that she isn’t gonna be around if she smokes and she wasn’t around her other grandkids when they were little because of the same reason. I don’t see how smoking cigarettes is more important than being in your grandkids life. 🤷🏻‍♀️