Civil War field medicine created many veterans addicted to this class of drug that includes morphine
The American 
medical community embraces cocaine as a miracle cure for a variety of ailments, 
... "poisonous drugcaffeine, which belongs in the same class of alkaloids with 
cocaine,... [DOC] [TLE] opium | drug | Britannica.com [PAR] Narcotic drug that is obtained from the unripe seedpods of the opium poppy ...