20 to 30 years ago there are many studies which suggested that dietary supplements of beta-carotene and vitamin A might reduce the incidence of lung cancer. .

Beta-carotene and vitamin A are antioxidants which may prevent carcinogens from damaging DNA to cause cancer.

Beta-carotene supplements are not harmful to non-smokers. But smokers have got more lung cancer compared to others.

Food rich in beta-carotene, other carotenoids and other phytochemicals found in fresh vegetables and fruits are very healthy food for all including smokers.

We must be always careful with synthetic food supplements.

Food supplements are good if they are absolutely necessary. Before taking, it is a must to consult with your doctor or dieticians.