>> Like britain invaded china ( opium wars ) and forced opium on china's population.

  > how did Britain force the Chinese population to consume Opium?

I don't know if you are just ignorant about history and unwilling to Google, or if you are making the point that of course British did not force feed opium to the people.

What is very well established is that the british fought a war , literally called the opium war by Western historians themselves with the main objective of keeping their opium distribution into China open after the emperor banned it

Their action was akin to if some majority owner of Purdue pharma invades US and forces US government to "keep the oxy market open" while letting "people make their own decision".