Proof please.
Will this do?
https://www.scotsman.com/arts-and-culture/scots-who-hooked-china-opium-1471413
https://www.scotsman.com/arts-and-culture/opium-wars-how-scottish-traders-fed-habit-2510684
https://www.britannica.com/topic/Opium-Wars
https://thewire.in/books/book-review-opium-inc-british-raj-narco-state
https://www.bbc.com/news/world-asia-india-49404024
https://aeon.co/essays/from-tea-to-opium-how-the-scots-left-their-mark-on-china