Background: Colorectal cancer (CC) is the third most common cancer and the second leading cause of cancer-related mortality. Modifiable risk factors include improper diet, alcohol consumption, and smoking. Considering the high prevalence of smoking in developing countries, this study aimed to measure the prevalence of smoking in patients with CC. Materials and Methods: Overall, 200 patients with CC who were referred to the Reference Pathology Center of Bandar Abbas, Iran, between 2017 and 2020 were included in this study. The required data were collected using a self-declaration checklist or by examining patients’ files. The obtained data were analyzed by SPSS 22.0. Results: In general, 27.5% had a history of smoking, and almost half of them had quit smoking. About 13% of the studied patients were passive smokers. Among the 55 people with a history of smoking, most of those over 30 years of age had a history of smoking. Conclusion: It was found that smoking can have a significant effect on the occurrence of CC (in those who have quit smoking or are actively using cigarettes). However, it cannot be concluded that quitting smoking after CC diagnosis affects CC. In addition, most smoking patients diagnosed with CC had more than 30 years of smoking history and smoked more than ten cigarettes per day. Therefore, being a heavy smoker has an essential effect on the incidence of CC.
Rad et al. (Sun,) studied this question.