I am a bit concerned that this debate is becoming too polarised, and unhelpful.
Smoking in pregnancy is the single largest preventable cause of foetal and maternal ill health in the UK, and the impacts of smoking in pregancy also continue into childhood (and potentially into adulthood). As a feminist, I wish that the evidence on this could be dismissed on the basis of misogynistic researchers, but I am afraid that it can't.
Women who smoke are more likely to lose their baby and to suffer placental abruption or placenta praevia.
Children born to women who smoke in pregnancy are significantly more likely to be stillborn, to have IUGR, to be premature, to die in the fist four weeks of life, to suffer cot death, to develop asthma and to have other respiratory problems (eg hospitalisation for respiratory infections).
These risks are increased when babies are exposed to secondhand smoke after birth, which is the case for most babies whose mothers smoke in pregnancy, because hardly anyone who smokes through pregnancy gives up after their baby is born.
The point is that these are horrendous outcomes, and it would be unethical not to tell people about them. There may be arguments to be had about policing pregnant women's behaviour, but given that most women (and especially those with wanted pregnancies) desperately want to keep their babies safe, I think that it is a bit of an academic argument. I would certainly promote the right to know about the risks ahead of concerns about behaviour policing, which remains largely theoretical in the UK.
But smoking in pregnancy is also very common - according to the national feeding survey, more than one in every six pregnant women smoke throughout their pregancy, but it is likely that this is a huge underestimate because many women do not accurately report their smoking status to their midwife because of the stigma attached to smoking in pregnancy.
Smoking is an addiction, and it is not easy for women to quit. Women who smoke during pregnancy should never be automtically labelled as selfish, uncaring, or bad parents.
The condemnation approach is actually very unhelpful because it makes it less likely that women will feel able to be honest about smoking, and makes it harder to support them. It also contributes to guilt, and makes it harder for women to accept the size of the health risks both to them and their baby (which has been seen in this thread).