Nicotine Anonymous
https://nicotine-anonymous.org/
 
Campaign for Tobacco-Free Kids
http://www.tobaccofreekids.org/
 
Centers for Disease Control and Prevention
http://www.cdc.gov/tobacco/data_statistics/fact_sheets/cessation/quitting/
 
Smoking Cessation Leadership Center
http://smokingcessationleadership.ucsf.edu/