Abstract- "Electronic cigarette (e-cigarette) use has recently increased among adults in the United States. Previous studies have identified physical health outcomes associated with e-cigarettes. Few studies have examined the relationship between e-cigarette use and mental health outcomes. This study aimed to investigate the relationship between e-cigarette use and depression...In a representative sample of adults in the United States e-cigarette use is associated with depression, predominantly in widowed/divorced/separated, unemployed and people who use marijuana. This association was independent of potential cofounders".