1. Tobacco use is causally linked to cancer through exposure to carcinogens during the curing and smoking processes. The major carcinogens include nitrosamines, benzene, polycyclic aromatic hydrocarbons, and cadmium. 2. Quitting smoking improves health outcomes for cancer patients and reduces all-cause mortality, cancer mortality, and risk of second primary cancers. Continued smoking can increase treatment toxicity and risk of recurrence. 3. India has implemented tobacco control programs like the National Tobacco Control Programme and COTPA to reduce tobacco use and exposure to carcinogens.