Although there are multiple risk factors for osteoporosis, smoking is definitely one of them, especially in postmenopausal women. Smoking also increases the risk of hip fractures.
U.S. Department of Health and Human Services. The Health Consequences of Smoking – 50 years of Progress: A Report of the Surgeon General. Atlanta, GA. Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health, 2014.