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Cigarette smoke contains ethylene, which causes plant leaves to drop and seeds to grow horizontally instead of vertically. Carbon dioxide, also found in smoke, benefits plants by aiding in photosynthesis.
Megan Smith has been a freelance writer and editor since 2006. She writes about health, fitness, travel, beauty and grooming topics for various print and Internet publications. Smith earned a Bachelor of Fine Arts in writing from New York University.
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