Answer:
pros- Britain got Hong Kong after the first Opium war, Britain and France also won the second Opium war which allowed them to establish places in China where trade was controlled by these European powers (spheres of influence)=more European influence in East Asia (this is a pro for the Europeans, a con for the Chinese)
this, along with the boxer rebellion and the Sino-Japanese war set the stage for the Wuhan revolution that would overthrow the Qing dynasty and establish Sun Yat-Sen as the first president of China (yay democracy)
cons- China and the Qing dynasty were severely weakened by these wars and also the trade in opium itself bc it made people high, lazy, and more dependent on Europeans. One of the factors that helped along the slow death of the Qing Dynasty.
These wars also caused China to become even more economically imperialized by Britain and France.
basically, all pros for the Europeans, all cons for the Chinese :/
Step-by-step explanation:
There were not many pros for China tbh, their economy may have been initially boosted by the trade in opium, but seeing as it was mainly conducted by Western powers like Britain and France, its unlikely that China reaped many benefits from the trade at all. As for the war, it only increased European presence in East Asia as Britain won the first war and was given the island of Hong Kong as compensation. Britain and France also won the second Opium war. The opium trade in China was very lucrative for the Brits as the opium was harvested in India (which they controlled) and then exported to china, where people bought it, got high, lazy, and altogether made it way easier for foreign powers to crave out "spheres of influence" and generally weaken China until it had virtually no control over its own land or people.