To avoid lung cancer, good nutrition is a key factor and foods such as collard greens, broccoli, orange juice and seafood (especially cod) are the key ingredients. These foods in particular will help to give you the necessary nutrients and minerals that are helpful in preventing lung cancer. Collard green leaves are full of sulfur containing compounds that support detoxification. Broccoli. Broccoliis the only vegetable with a sizable amount of sulforaphane, a powerful compound that boosts the body's protective enzymes and flushes outcancer-causing chemicals. Some researchers say oranges are a complete package of every natural anticancer inhibitor known up to now. Limonene in oranges can stimulate our antioxidant detoxification enzyme system, which helps to prevent and stop cancer.