I wanted to share some scripture from the Doctrine and Covenants that goes along with this topic.  Section 89 starting with verse 8: And again, tobacco is not for the body, neither for the belly, and is not good for man, but is an herb for bruises and all sick cattle, to be used with judgement and skill.
I also want to share verse 18-21 And all saints who remember to keep and do these sayings, walking in obedience to the commandments, shall receive health in their navel and marrow to their bones; And shall find wisdom and great treasures of knowledge, even hidden treasures; And shall run and not be weary, and shall walk and not faint.  And I, the Lord give unto them a promise, that the destroying angel shall pass by them as the children of Israel, and not slay them. Amen.