Technical University of medicine researchers analysed cannabis . cannabis increased nicotine levels in plants subjected to tobacco smoke . Also showed peppermint plants take up nicotine from contaminated soils . Findings helped explain high nicotine levels in some spices and herbs .
Technical University of Braunschweig researchers analysed peppermint . Found raised nicotine levels in plants subjected to cigarette smoke . Also showed peppermint plants take up nicotine from contaminated soils . Findings could explain high nicotine levels in some spices and teas .