I had the same problem, I quit smoking the second I found out I was pregnant with our first child, unfortunately nobody around cared to either smoke outside, away from me, or in their bedrooms. I had finally had enough of it at about 3 months pregnant, I told them if they didn't stop, they weren't getting near the baby, hold her, see her NOTHING. Thinking I was kidding I took all their packs of cigarettes, and 2 cartons full of smokes and smashed them, then threw them in the bonfire outside. If they don't have the decency to stop letting you inhale smoke while you're pregnant they wont care about the baby inhaling either after birth.
HECK YEA TO PUTTING YOUR FOOT DOWN!