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Frequent users of cannabis—including marijuana and hashish—are more likely to have gum disease, Columbia University dental researchers have found.

Writing in NEJM, Columbia ophthalmologists say a form of Vitamin B3 may be able to stop the progression of glaucoma by protecting the eye's neurons.

Columbia neuroscientists find that a part of the brain filters out internal noise made by the body, which may help explain such hearing disorders as tinnitus.