At the peace table China ceded Hong Kong to England and opened up five treaty ports to trade with the west. Opium was never mentioned in the peace treaty, so it was still contraband and the illegal traffic continued until 1908. It is an ugly story. Not all Englishmen approved of England's action in regards to China. Many people including Gladstone spoke out against it.
Oriental poppies contain opium.
The corn poppy, however, does not contain opium. It is an emblem that commemorates those who died in wars. The poppy was noticed during the Napoleonic Wars, as the mysterious flower that bloomed around the fresh graves of fallen soldiers. A Canadian doctor, Lt.-Col. John McCrae, immortalized the poppy in his famous poem In Flanders Fields.