The aim of the proposed study is to assess how adding messaging to cigarette packages about filter vents and filters influences respondents awareness of filter ventilation, beliefs about the function of filter vents and filters, smoking behavior, ratings of cigarette satisfaction, smoking topography, exposure to nicotine and carbon monoxide, perceptions about the risk of smoking, and intention to stop smoking. The protocol will consist of a randomized experiment via two-week field study. We hypothesize that exposing smokers to messages about filter vents and filters will increase awareness and knowledge of the impact of filter ventilation on cigarette smoking behavior and increase intention to stop smoking. Exposure to messages on packs will also lower ratings of cigarette satisfaction but have no significant impact on smoking behavior, topography, and exposure to nicotine and carbon monoxide.