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High Doses Of Vitamin B6 and B12, From Individual Supplements, Have Been Linked To Increased Risk (30-40%) Of Lung Cancer, Especially In Male Smokers. But No Case Has Been Reported When Taken As A Multivitamin. This Is One Study That I May Not Lose Sleep Over Because Of All The Discrepancies In The Results.

High doses of vitamin B supplements tied to lung cancer risk, study says – CNN

http://www.cnn.com/2017/08/22/health/vitamin-b6-b12-lung-cancer-study/index.html

Men who took high doses of vitamin B6 and B12 supplements had a higher risk of lung cancer, and the association was highest among current smokers, according to a study published Tuesday.