I heard a news report on the radio today regarding a new study out of the UK. They have found evidence that people who take consistent excess doses of Vitamin A have a propensity toward lung and other types of cancer. They think this may explain why some people develop the disease, even though they've never smoked. Non-smokers always want to chalk it up to second hand smoke, but researchers think that is probably not the case. The same studies have suggested that excess doses of Vitamin E may be responsible for prostate cancer in some men. Moderation in all things maybe?