It is also found in nicotine containing liquids used for vaping and flavored cigarettes. Puffing characteristics differ between smoking and vaping. Adolescents were more likely to start vaping through flavored e-cigarettes. The extent to which decreasing cigarette smoking with vaping leads to quitting is unknown. The health benefits of reducing cigarette use while vaping is unclear. Though, the oxidative nicotine metabolites were less in those who were vaping. Users vaping without using nicotine exhibited symptoms of dependence, according to a 2015 study. E-cigarettes are promoted to a certain extent to forge a vaping culture that entices non-smokers. Hunter puffed on his e-cigarette during a congressional hearing about vaping. Online forums based around modding have grown in the vaping community. The efficacy and safety of vaping for quitting smoking during pregnancy is unknown. Adolescent experimentation with vaping appears to encourage continued smoking. The effectiveness of vaping for quitting smoking among vulnerable groups is uncertain. The evidence is conflicting to support or dismiss vaping for quit smoking. Most young people are not vaping to help them quit tobacco.