Is this wrong??

Is it wrong of my to not allow my one year old to go into a car my sister smokes in regularly? She wants to take my daughter and i in her car in her sons carseat that has second hand smoke. Im absolutely 100% not ok with that and now she has an issue with me bc of that. Whats ur thoughts? I used to smoke but stopped when i got pregnant, she smoked her whole pregnancy and is still smoking.