I think it's a good idea to give her some information, but also tell her it because she's likely to just turn around and throw out anything you print off for her before she even reads it...Once your back is turned.
If she's smoking that much, her baby is in a huge risk of being born premature. She probably won't think that's very serious, but nicu is very serious and could potentially mean death or having a baby with downs or autism or other mental or physical disablility from being born so early. Many preemies are deaf or blind because of it. It also costs a lot more and her insurance may not cover all of it. It's likely her baby will also have asthsma and need an inhaler, costing more money and drastically affecting it's life forever. My friend's smoked way less, only a few times a week and a couple of their babies still needed inhalers at like 4 months old. Very sad.
Alcohol during pregnancy of course leads to fetal alcohol syndrome, which is very serious. It can mimic many of the same symptoms as something like adhd, with kids who can't focus in school. They act off, they get in fights, they get bad grades, they're more likely to drop out. They're more likely to do criminal acts because of their out of control behavior. They have a very very hard time even getting a job, let alone keeping it. Nothing advanced either. Most people with fas can't even keep a job like unloading trucks or stocking shelves. They rarely have successful relationships and they grow up pretty damn lonely and miserable.
Doing drugs, especially early on, can really harm the development of the organs and the brain. She may very well have caused her baby to be deformed. At the very least, she's depriving it of oxygen and nutrients and is likely to have an addicted baby who has to detox in nicu. Which means that cps will likely step in and take the baby away.
So basically tell her that she's going to lose the baby one way or the other if she doesn't get her act straight. The nurses will get involved and the doctors will get involved and lastly, you'll call cps yourself if she doesn't straight up because you're not one to suffer fools and child abuse lightly. And that's what it is.