Brain › Science & NatureWhat is the primary addictive substance found in tobacco?CathinoneEphedrineNicotineGlaucineAnswerThe correct answer is C) Nicotine.More Science & Nature questionsStars consist mainly of hydrogen and which other gas?What is the speed of light in a vacuum?What is the unit of electrical resistance?This element, when overcome with extreme heat and pressure, creates diamonds.Which is the longest bone in the human body?How many planets are in our Solar System?Play Brain · Practice