What does God think about people smoking?
God considers the human body His sacred temple. The literal, flesh and blood bodies of people have been considered the temple of God since the Holy Spirit came to dwell within believers, in Jesus Christ, at Pentecost (Acts, chapter 2).
Even nonbelievers are potentially the temple of God. He is against anything that defiles (or harms) His temple. He loves His creation called man, and has gone to great lengths--particularly in giving Old Testament Law--to instruct in what should and should not be consumed by the flesh body.
We know of the deadly-effects that smoking has on the body. Many of us have lost friends and/or relatives who smoked throughout their lives. This generation, more than any other that came before, is responsible for using restraint in using things that will harm the body, because of the great strides in vast amounts of research information that warns us about such things. God's Word says:
1 Corinthians 3:17: "If any man defile the temple of God, him shall God destroy; for the temple of God is holy, which [temple] ye are."
1 Corinthians 6:19: "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?"