Smokers in family and new baby?

Angel
How did you handle this uncomfortable topic with family members of yours who smoked? I have several and don't know how to bring it up or not hurt feelings. Mind you they are all a different generation and smoking outside then coming in smelling and covered in smoke to hold the baby is sufficient in their minds...I have read several sources that say this is not enough. That in order to be safe they must wash their hands and change shirts in order to prevent the smoke from getting to the baby. How will I tell our family that this is our wishes without hurting feelings? Anyone else approach this topic and what did you say?