@Honeybee85
A few of my friends have smoked during pregnancy with the ‘permission’ of their midwives. No more then 5 a day and they were told that yes the cigarettes are bad, but the stress that comes from the withdrawal effects after quitting is much worse for the fetus
These midwives who (allegedly) gave this 'permission' for the pregnant women to smoke, should be struck off. Because that is a load of utter bollocks that giving up smoking is more harmful to the baby than carrying on smoking. It's a myth that was consigned to the history books many decades ago.
Several days ago someone posted a similar thread that was deleted by mumsnet for being a previously banned poster, but they put a few links to websites that show what a massively detrimental effect smoking whilst pregnant has on the unborn baby.
www.mumsnet.com/Talk/am_i_being_unreasonable/3576045-2-puffs-daily-on-cigarette-while-pregnant?noti=1#86778252
Many interesting facts in there about the harmful effects you inflict on your unborn baby by smoking whilst pregnant. Best to read them, and not listen to the bullshit that is peddled about how it's better for the baby for the mother to not quit smoking. 
I despair for humanity when I read stuff like this, and to read it came out of the mouths of midwives! Words fail me!!
Unless your 'friends' were making it up, which I think is more likely. (I bloody hope so anyway!)
I struggle to fathom how any intelligent adult in the 21st century thinks a woman smoking when she is pregnant is OK.
It's really not! If you value the health and welfare of your unborn baby, FFS quit smoking before you even TRY to conceive (or as soon as you know you're pregnant if you didn't plan it!) But for the love of God, stop !!!