This study is a randomized, double-blind, placebo controlled study of 4 grams/day n-3 LCPUFA supplementation versus placebo for 12-weeks. The study will recruit post-partum women with a recent history of stopping smoking while pregnant. The primary outcomes will include time to smoking relapse and change in self-reported nicotine cravings. The secondary outcome will be point prevalence abstinence at 6- and 12-weeks. We will also collect safety and tolerability data.