Baseline visit (Week 0) This visit will occur within 6-weeks of delivery. The investigators will review inclusion and exclusion criteria and obtain informed consent. Subjects will complete the Fagerström Tolerance Questionnaire, the Minnesota Withdrawal Symptom Checklist, Beck Depression Inventory, and completes a detailed interview on tobacco use habits including recording prior cigarettes per day smoked. Research interventions will include expired CO level and blood collection for red blood cell phospholipid membrane and nicotine metabolites (serum cotinine).