"What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God’s." (1 Cor. 6:19-20) "I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service. And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God" (Rom. 12:1-2). The only sacrifice that was acceptable to God was one without spot or blemish. How can we present ourselves as a sacrifice that is holy, meaning separated from sin, if we are addicted to tobacco and destroying our health.
Some people refuse to admit that smoking is harmful to one's health. Even if smoking did not harm people's health, it certainly harms a Christian's testimony!
1 Thessalonians 5:22 tell us to
"Abstain from all appearance of evil." God is saying that we are to abstain not from only evil itself but even from that which would appear to be evil. Barnes says, "There are many things which, in themselves, may not appear to us to be positively wrong, but which are so considered by large and respectable portions of the community; and for us to do them would be regarded as inconsistent and improper." (Barnes New Testament Notes, 1 Thess. 5:22). It is sinful to let our pleasures stand in the way of our testimony and let our indulgences be a stumbling block to others.
Information gathered from the Holy Bible and
http://www.bible-truth.org/Smoking.html