Thank you to those sharing very personal insights and difficult experiences. 
I can't agree that what an adult chooses to put in their body as an adult, like nicotine and tar, alcohol, poor processed food options, or unhealthy levels of fat and sugars, red meat etc, is anywhere near the same, or comparable in any way.
Bringing a baby into the world is being responsible for the wellbeing and protection of a new life, then it isn't ok to confirm abusing yourself as you have a dependent, a serious responsibility, and it should be, and is,community responsibility to be sure the best is promoted for all our babies. The best food, care, socialising, protection, education, experiences. This is all social and personal responsibility. It's why parents fight for their children, or should, as the children don't have the choice.
Although it seems sometimes they do when a DM is forced to bf despite hating it when baby refuses bottle so stubbornly! 
It's balance isn't it. You don't seem to have choice there, and many dont, medically I mean.
...but weighing up the personal cost (and financials) to DM/family and baby of any choices available to us.