Littlelouse - I think your misunderstandings on the thread you've just linked to actually prove that sensible, mature people do just give up when they're pregnant (if they smoke in the first place) such as the lady you're conversing with in this screen shot.
I'm incredibly pleased for anybody who manages to quit, with or without support, whether they are sensible and mature or not. However, people's ability to quit isn't generally linked to sensibleness or maturity IME. There are several factors which do affect how difficult someone can find it to quit, including their social and economic circumstances, whether they have MH issues (this one is HUGE), how much they smoke, how long they've been smoking for, how young they were when they started, how ambivalent or positive they feel about their pregnancy, whether their partner smokes, is supportive, is abusive ...
You might like to think that everyone needs help to give up but it's just not true. Lots and lots of people, me included, just give up because it's he right thing to do! You seem to be trying to force an agenda which, if this thread is anything to go by, isn't as desperately needed as you may like to think it is.
I do have an agenda, you're correct. I want as many smokers as possible to find a way to quit, for their own health and the health of those around them. What's your agenda? Everybody has one. I can't quite work yours out because the conclusions I keep coming to aren't very nice. Do you think there's not a need to do anything about 1 in 10 women smoking at the time of delivery because in your opinion they're not 'mature' or 'sensible'? Does that mean their babies don't matter?