Which of the following is not a common cause of abdominal wall hernias

Hernia development is more common in pregnancy due to hormonally induced laxity of pelvic ligaments. It is also more common in the elderly due to the degenerative weakness of muscles and fibrous tissue. An inguinal hernia is less common in obese patients with hernia risk being negatively related to body mass index (BMI) contrary to widespread belief. Hernia is more common in smokers.