However, PET radiotracers may also be used to evaluate the deposition of inhaled substances using carbon-11 ( 11 C) and fluorine-18 ( 18 F) (62), inflammation using 18 F-fluorodeoxyglucose ( 18 F-FDG) (63) and ventilation using nitrogen-13 ( 13 N 2 ) (63)
Timiryazev Institute of Plant Physiology, Moscow, Russia Artem Alekseevich Fomenkov Department of Dermatology, Kobe University, Kobe, Japan Takeshi Fukumoto Department of Pathology, Federal University of Espirito Santo, Vitria, Brazil Blima Fux Department of Community Medicine and Family Medicine, All India Institute of Medical Sciences, Gorakhpur, India G
I believe it's #18
After all, many starter E-Cigs are specifically designed to look and feel like tobacco cigarettes