I would like to comment that studies are now coming out that the use of multi-vitamins and/or the use of anti-oxidants ( vitamin C, E ) could have a role in some cancers for people that smoke. Beta-carotene has been proven to be a factor in causing lung cancer in smokers. Smokers taking this regimen should really take a look at the studies that have been done. I had a mild heart attack in "95" and started taking such a regimen because at the time the litature from the medical professions was positive that this was a good step to warding off a reoccurance. I could not give up the ciggarettes, and I choose to continue smoking at a decreased amount. Around 2000 is when a small white patch showed up on my tongue. It wasnt until 2003 that it turned into an ulcer that wasnt going away. As a part time smoker taking vitamin C, I believe this was the cause for my ateries to harden at a great rate and causing me to have a 5 by-pass two months before the cancer operation.If other members were on such a regimen as mine I would like to hear your story. Also I would like to add that this vitamin regimen may increase the risk of dying from cancer in male smokers. Male smokers who used multi-vitamins alone or in combination with other vitamins had a higher risk of dying from cancer than nonsmoking males who took vitamins.