The country that banned import of Indian opium is both China and Britain. Here's an explanation:

Opium Trade in India
- In the 18th and 19th centuries, opium was a major cash crop in India and was cultivated under British East India Company's rule.
- The opium produced in India was primarily used for export to China, where it was in high demand.
- The British East India Company established a monopoly over the opium trade in India and began exporting large quantities of opium to China in exchange for tea and silver.

Opium Wars
- China soon realized the harmful effects of opium addiction on its population and attempted to ban the import of opium from India in the early 19th century.
- However, the British East India Company continued to smuggle opium into China, which led to the First Opium War between China and Britain in 1839-1842.
- The war resulted in China's defeat and the signing of the Treaty of Nanking, which forced China to open its ports to British trade and pay a large indemnity to Britain.
- The opium trade continued to flourish despite China's protests, leading to the Second Opium War in 1856-1860.
- This war resulted in further concessions by China, including the legalization of opium trade and the opening up of more ports to foreign trade.

Banning of Indian Opium
- In the late 19th century, both China and Britain began to take steps to curb the opium trade.
- China passed laws to ban opium smoking and cultivation, and in 1906, it banned the import of Indian opium altogether.
- Britain, which had a vested interest in the opium trade, also took steps to limit its production and consumption in India.
- In 1917, the British government passed the Dangerous Drugs Act, which regulated the manufacture, sale, and distribution of opium and other drugs in India and other British colonies.

In conclusion, both China and Britain played a significant role in the opium trade, with India serving as a major producer and exporter of opium. However, by the early 20th century, both countries recognized the harmful effects of opium addiction and took steps to ban or regulate its import and consumption.