Cash Payment and Counseling During Pregnancy

"The intervention consists of: (i) in person brief behavioral counseling, (ii) the evaluation of the smoking status using breath carbon monoxide, and (iii) cash payment of 25 Euro if the reading does not exceed a carbon monoxide value 3 ppm ( ppm = parts per million) on two consecutive measurements per week. The intervention starts at the earliest in pregnancy week 15 and lasts until the delivery. If they relapse, the reward is not paid. However, in the following week they have the opportunity to quit smoking and being rewarded again."