A longstanding issue among members of the LDS Church is whether it is permissible to ingest drinks containing caffeine that are not coffee or tea. In 1918, Frederick J. Pack, a Mormon professor at the University of Utah, published an article in an official church magazine in which he reasoned that because Coca-Cola contained caffeine, which is also present in tea and coffee, Mormons should abstain from Coca-Cola in the same way that they abstain from the Word of Wisdom "hot drinks". Since Pack's article, many Mormons have come to believe that the reason tea and coffee are proscribed is the presence of caffeine in the drinks. However, the church has never stated that this is the reason for the prohibition.