The Church of Jesus Christ of Latter-day Saints, Doctrine and Covenants, section 89 (Word of Wisdom), verse 2 says "not by commandment or constraint".
From the beginning, That wording led to debates. Brigham Young called for a sustaining vote to observe the revelation at the Sept. 9, 1851 General Conference. I understand the delay was to give people a chance to adapt.
What is the official status now? It says it is not a commandment. Brigham Young says it is something that is observed.