What is the purpose of smoke testing?

The purpose is to find possible leaks in the sanitary sewer system and roof drain connections.

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1. Do I have to be at home for the sewer testing?
2. Is the smoke harmful?
3. What is the purpose of smoke testing?
4. What should I do if smoke gets into the home or business?
5. I will not be at home during the smoke testing and I have pets; what should I do?
6. If smoke enters a home or business, how long does it take to dissipate?
7. Can smoke block sewer lines?
8. What happens if defective sewer lines/plumbing or lack of traps are found?