Which of the following drugs is most likely to result in addiction among those who have ever used it?: (A) alcohol, (B) tobacco, (C) cocaine, (D) heroin
Answer is B. Almost one-third of people who have tried tobacco become addicted. In comparison, about 15% become addicted to alcohol. Heroin is also highly addictive (23% of users become addicted), but since so few people even try heroin, the addiction rate in society as a whole is quite low (0.4%).