Reidpath, Daniel D., Davey, Tamzyn M., Kadirvelu, Amudha, Soyiri, Ireneous N., Allotey, Pascale, "Does one cigarette make an adolescent smoker, and is it influenced by age and age of smoking initiation? Evidence of association from the U.S. Youth Risk Behavior Surveillance System (2011)", Preventive Medicine, 2014