Female 2 Humans 2 Male 2 Middle Aged 2 Smoking Cessation 2 adult 2 female 2 human 2 male 2 middle aged 2 nicotine gum smoking cessation 2 tobacco dependence 2 Adult 1 African American 1 African Americans 1 Aged 1 Article 1 Cognitive Therapy 1 Combined Modality Therapy 1 Developing Countries 1 Early Detection of Cancer 1 Feasibility Studies 1 Intention 1 Lung Neoplasms 1 Patient Dropouts 1 Self Efficacy 1 Smokers 1 Surveys and Questionnaires 1 Tobacco Use Cessation Products 1