Beta Carotene Supplements!

Vegetables rich in beta carotene are probably protective against some cancers, but beta-carotene supplements are toxic and increase the risk of lung cancer.

Help Your Lungs With Onions

Studies have found a significantly reduced risk for lung cancer among people who eat quercetin-rich foods, such as red onions. Studies also show that quercetin is better and more efficiently absorbed from onions than from other foods.