Lung cancer patients definitely should not smoke. Many lung cancer cases are caused by smoking, and if a patient quits smoking after the onset of the disease, their prognosis is much better compared to those who continue smoking. Additionally, there is advice to avoid certain so-called trigger foods. For cancer patients, the recommended meats are fish and poultry. This recommendation is not really due to the issue of trigger foods but because fish and poultry are easier to digest and absorb. During cancer treatment, the tumor itself causes a significant breakdown of proteins in the body. Since proteins are a fundamental basis for bodily functions, without them, human survival would be nearly impossible. Therefore, it is essential to replenish proteins. The main sources of protein include meat, eggs, dairy products, soy products, and nuts, which are all crucial sources of protein.