http://www.niams.nih.gov/Health_Info/Bone/Osteoporosis/Conditions_Behaviors/bone_smoking.asp
National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health
Cigarette smoking causes heart disease, lung and esophageal cancer, and chronic lung disease. Additionally, several research studies have identified smoking as a risk factor for osteoporosis and bone fracture.