1.	Evaluation of Treatments to Improve Smoking Cessation Medication Adherence Phase: Phase IV Type: Behavioral study, Educational/Counseling/Training, Prevention Status: Closed Age: 18 and over Sponsor: NCI, Other Protocol IDs: H-2010-0049, 9P50CA143188, NCT01120704
2.	Identifying Treatments to Motivate Smokers to Quit Phase: Phase IV Type: Behavioral study, Prevention Status: Closed Age: 18 and over Sponsor: NCI, Other Protocol IDs: H-2009-0203, 9P50CA143188, NCT01122238
3.	Improving the Population-Wide Effectiveness of U.S. Tobacco Cessation Quitlines Phase: Phase IV Type: Behavioral study, Educational/Counseling/Training, Health services research Status: Completed Age: 18 and over Sponsor: NCI, Other Protocol IDs: H2009-0074, 1RC1CA144382-01, NCT01087905
4.	Identifying Optimal Smoking Cessation Intervention Components (Cessation) Phase: Phase IV Type: Behavioral study, Prevention Status: Closed Age: 18 and over Sponsor: NCI, Other Protocol IDs: H-2009-0204, 9P50CA143188, NCT01116986
5.	Treating Low-Income Smokers in the Hospital Emergency Department Phase: No phase specified Type: Behavioral study, Prevention Status: Closed Age: 18 and over Sponsor: NCI, Other Protocol IDs: 0907005437, R01CA141479, NCT01328431