Ok, this probably isn't going to be the most popular opinion around, but here it goes anyway;

when I found out I was pregnant, I was smoking about a pack a day. I started smoking when I was 13 and since then, smoked anywhere from 1/2 a pack to 2 packs a day. I still quit smoking when I found I was pregnant for one reason - I had no choice. I simply could not put a cigarette in my mouth knowing that my baby was going to recieve the same toxins I was. It isn't right to force a child of ANY age to smoke cigarettes. It's not just your body anymore, it's your babies body you're affecting as well. In my opinion, there's no excuse. What it comes down to is what's more important - your cigarettes or your baby. Yes, its hard, but that's not an excuse. If your baby is more important to you than your cigarettes, you won't smoke.

I hope that doesn't offend anyone, but thats MY opinion based on my experiences, as I was a heavy smoker for years.