The investigators' hypothesis is that post-partum former smokers randomized to n-3 LCPUFA supplementation will be less likely to relapse and have less nicotine cravings compared to women allocated to placebo. To test this hypothesis they will conduct a 12-week, randomized, double-blind, placebo controlled study of 4 grams/day n-3 LCPUFA supplementation versus placebo. Participants will be enrolled prior to hospital discharge. The primary outcomes of the trial will be time to smoking relapse and change in self-reported nicotine cravings. The secondary outcome will be point prevalence abstinence at 6- and 12-weeks. compliance will be monitored by measuring red blood cell phospholipid fatty acid content and verify smoking cessation through end-expired CO and cotinine.