This important and interesting trial concerned only the pregnant women themselves, but it is well known that people with a partner who smokes find it easier to stop smoking if they support each other by stopping together. That is also better for the new baby and for any other children in the household.
It would therefore make sense to encourage and help partners who are smokers to stop at the same time. This should certainly involve personal counselling and follow up, but not necessarily an additional financial incentive. I suggest that future studies building on this one should also collect data on smoking by the prospective fathers.
Competing interests: No competing interests