Altria closes e cigarette brands as it eyes Juul, awaits iQOS decision Young users of electronic cigarettes exhibit reduced cardiorespiratory fitness Journal of Applied Physiology American Physiological Society Tobacco Nicotine Rutgers Addiction Research Center (RARC) Nicotine use in teens linked to higher depression and anxiety rates, especially with vaping and smoking combined. A large study of over 60,000 U.S. middle and high school students found that teens