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What is Vitamin A? (Linus Pauling Institute)
More About Beta Carotene (Mayo Clinic)
Vitamin A and Smoking May Increase the Incidence of Serious Disease (BCCancer)
Beta Carotene May be Harmful to Those at Risk for Lung Cancer (NCI)
Beta Carotene: Good for Non-Smokers, Bad for Smokers? (Dr. Alan Gaby)
Vitamin A May Help Prevent AMD -- If Used Correctly (Science Daily)