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13. Smoke exhaled from a smokers longs is called Mainstream smoke .

True or false

User DIGI Byte
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2 Answers

2 votes
the answer it its false. welcome!★
User Venkat Selvan
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False because mainstream smoke is defined as smoke from a cigarette or pipe. Second hand smoke is smoke that has been inhaled by someone then exhaled, making you the "second" one to breath it :)
User Manoj Talreja
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