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If it is a sin to you, don't smoke. People want to control and judge people based on their own beliefs, don't do that. I can ask a million questions like this one. Is it a sin to eat too much or too little? Is it a sin to not comb your hair? Is it a sin to pass gas? Is it a sin to go to church and pray with your head uncovered (women)? Worry about yourself and your temple and that will be good. Jesus commands we do good. Breaking the laws of your community is a sin. Don't smoke inside of a building or within 20 feet of a business entry and exit way in California. Yet, you can go into a small businesses and see the owners smoking inside anyway (liquor stores).