Final answer:
The Opium War did not result in Britain ceasing its opium trade with China; instead, it led to the Treaty of Nanjing, with China ceding Hong Kong and opening up trade under unequal terms.
Step-by-step explanation:
The Opium War resulted in several consequences for China, but one outcome that did not occur was Britain stopping the sale of Opium to China. Instead, the Treaty of Nanjing was signed in 1842 after China suffered a humiliating defeat, which led to multiple impositions on China, including ceding the island of Hong Kong to Britain, opening additional ports to foreign trade, and granting the British extraterritoriality and most favored nation status.
This treaty marked the beginning of what were known as "unequal treaties" that progressively eroded Chinese sovereignty and opened China further to foreign influence and trade, including the continued opium trade.