1. Centers for Disease Control and Prevention. Tobacco use targeting the nation’s leading killer. Available at: http://www.cdc.gov/chronicdisease/resources/publications/aag/pdf/2011/tobacco_aag_2011_508.pdf#page=2&zoom=auto,–21,734. Acessed August 16, 2015.
2. Centers for Disease Control and Prevention. Smoking and tobacco use: economic facts about U.S. tobacco production and use. Available at: http://www.cdc.gov/tobacco/data_statistics/fact_sheets/economics/econ_facts/index.htm. Accessed August 16, 2015.
3. Benjamin R. Preventing tobacco use among youth and young adults: a report of the surgeon general executive summary. Available at: http://www.surgeongeneral.gov/library/reports/preventing-youth-tobacco-use/exec-summary.pdf. Acessed August 16, 2015.
4. Tobacco use among middle and high school students—United States, 2011-2015;Singh;MMWR Morb Mortal Wkly Rep,2016
5. Shape of the relapse curve and long-term abstinence among untreated smokers;Hughes;Addiction,2004