Which factor in the 39-year-old woman's profile increases her risk of developing osteoporosis?

• A. Family history of osteoporosis
• B. Smoking status
• C. BMI 30.1 kg/m2
• D. History of mild eczema

Answer: (B)

Smoking status increases osteoporosis risk because cigarette smoke contains toxins that disturb how bone is formed and broken down. Nicotine and other compounds promote bone resorption by osteoclasts while impairing osteoblasts, and they can reduce calcium absorption in the gut. Smoking also tends to lower estrogen levels and can lead to earlier menopause, which diminishes the protective effect estrogen has on bone. All of this means bone mineral density can decline more quickly, even in younger women, elevating the risk of osteoporosis and fragility fractures.

In this profile, a BMI over 30 tends to be protective for bone density due to greater mechanical loading and higher estrogen from adipose tissue, while a history of mild eczema has no clear link to osteoporosis. A family history does confer some baseline risk, but the direct, modifiable factor highlighted here is smoking, making it the best answer.