title: An in vivo radiotracer method to allow for cigarette filter ventilation during smoking.
mesh_terms: D004864:Equipment and Supplies; D006801:Humans; D007726:Krypton; D008722:Methods; D010947:Plants, Toxic; D011868:Radioisotopes; D012906:Smoke / Q000032:analysis*; D012907:Smoking; D014026:Nicotiana
chemical_list: D011868:Radioisotopes; D012906:Smoke; D007726:Krypton