The truth about opium

Opium trade -- China -- History -- 19th century; Opium trade -- India -- History -- 19th century; Opium trade -- Great Britain -- History -- 19th century; China -- Commerce -- India -- History -- 19th century; India -- Commerce -- China -- History -- 19th century; China -- Commerce -- Great Britain -- History -- 19th century; Great Britain -- Commerce -- China -- History -- 19th century; Opium abuse