text: The scientists begin their article noting that Growth of plants under elevated CO2 frequently leads to increased growth rates, but that was not the focus of their study. Many others have grown tobacco in elevated CO2 and confirmed that tobacco, like virtually every other plant in the world, benefits from higher concentrations of CO2. Matros et al. made a series of measurements on how elevated CO2 impacts nicotine, and they conclude that Cultivation of tobacco plants at elevated CO2 leads to a marked decrease of nicotine, the major nitrogen-rich secondary metabolite in tobacco at lower nitrogen supply and At higher nitrogen supply, nicotine content was not further influenced by CO2. See, if you are trying to quit smoking, elevated CO2 is your friend and it generally acts to lower the nicotine level of the plants!