Did you know Bayer (a dye factory at the time), of Bayer aspirin fame in Germany invented (with help) heroin as well as aspirin. It had both trademarked before 1900. Heroin was marketed as a cough suppressant and cure for TB and asthma. Aspirin was marketed for Rheumatism.
Early heroin users supported their habits by collecting and selling scrap metal, hence the name 'junkie'. Ninety five percent of the legal medical heroin today is used in Britain.