“…Several other GC/MS studies have also revealed that main‐stream cigarette smoke contains more than hundreds of compounds, including phenols, volatile carboxylic acids, long‐chain fatty acids, pyridines, hydroxycarboxylic acid and benzoic acids . Several studies have also detected pentadecanoic acid and phytol as constituents in collected cigarette smoke . The collected material consisted of a brown deposit that may include some tar and cigarette ash as well .…”