What two chemicals are extracted from the opium poppy?

1. What  two  chemicals are extracted from the opium poppy?

2. What  was  the significance of De Quincey’s writing about opium eating?

3. What  were  the approximate dates and who were the combatants in the Opium Wars?

4. How  is  it possible that heroin was at first sold as a non-addicting pain reliever?