Image from Antique Cannabis Handbook A blog reader pointed me to this interesting website that contains pictures of antique cough syrup preparations. The interesting historical information is that pretty much all cough syrups in the 19th and early 20th century contained some combination of alcohol, cannabis (marijuana), chloroform, heroin, and/or morphine. I suppose alcohol as a cough suppressant ingredient is not too surprising since it is still used even today. See chart below. Heroi…