Oh? Which industry regularly uses this as a part of standard business for consumers? Unless... you're just pretending to be too obtuse to understand the extremely obvious implication here.
As with asbestos, it (diamorphine) has some limited legitimate uses.
https://pmc.ncbi.nlm.nih.gov/articles/PMC3953108 https://pmc.ncbi.nlm.nih.gov/articles/PMC3953108