We smokers have logic; it's the evil nicotine monster that doesn't.
I don't agree with banning smoking in public, because for the most part they have not justified the move as they should have and it is not being implemented in a way as to respect smokers rights, it is all very anti-smoking rather than pro-quitting as it should be. But I digress.
Yes I think smokers who have children are committing child abuse, but then there are a lot of things that are child abuse that are overlooked – ear piercing with piercing guns and unnecessary infant circumcision being two such examples, also feeding your children nothing but Gregg's pasties.
In all fairness being a parent starts long before you conceive, in an ideal world smokers wouldn't have children given as the chemicals within cigarettes remain within their body even long after they quit smoking and so effect the children within their bodies as well – I plan to have children, they may very well suffer from my current addiction, but then of course they will also suffer from my use of commercial toiletries and the other pollution in the world, there are a lot of things that result in poor health of children, nothing is done to prevent such things.
Parents shouldn't smoke around their children, in my mind if you are smoking while in the same room or area as your child then you are committing a form of child abuse. I also think this has to be taken into consideration with terms of going elsewhere to smoke as well – there was research just a few months ago saying that parents who smoke, even when away from their children, can still cause deaths of babies who sleep with them because the CO2 still held within their bodies for several hours after they have had a smoke outside of their home away from direct contact with their baby.
You do have to take into consideration thought that smokers do need to smoke, a good parent will quit smoking when parent but because of our anti-smoking society we do not support the pro-quitting means to help mothers (and fathers) quit long-term such as using Easyway and similar methods, instead we have anti-smoking methods such as nicotine replacement that insist smokers quitting must suffer, this does not work long-term.
I think smoking is a social problem, if a parent is smoking right in front of their child they are to blame for the risk to their child's health, if smoking away from the child society is to blame for the risk to the child's health.