about the Beta Carotene....
there have been studies showing smokers faired worse with it than with out...
these studies came out after the studies that showed it might be beneficial.

of course i don't know, just thought i'd make you aware.

another slant, think about getting these vitamins ect. from food, instead of pills, there are trends of thinking that point toward the idea that the vitamins, ect when obtained from food work together in ways not possible in pill form.

tim