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The nicotine content of cigarettes is found in these tobacco leaves

Heres how to tell the two species apart: Tobacco hornworms have a soft red spike (or horn) on their posterior

This point is important because brand comparisons can sometimes make one product sound better in a way that implies lower risk

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a mathematics paper might cite 15 Article type: Fields with many review articles have structurally higher IFs because reviews attract far more citations than original research Database coverage: Some fields are more completely indexed in Web of Science than others These structural differences mean a raw impact factor number is meaningless without knowing which field it belongs to

Museum specimen, Louisiana State Arthropod Museum