There's a few possibilities there. It could be that she's the smoker. In which case she's smoking while pregnant. It could be that they're both smoking and she's going to give it up while pregnant. But even in someone who does have self control I'd be pretty skeptical of anyone fighting a drug addiction while their partner is still doing it. Or he could be the smoker. In which case he's going to be smoking around a pregnant woman and then an infant. Not to mention vastly increasing his own chances of an early but torturous death that they'll have to watch. It's just further evidence of people more interested in their own addictions than their families.