I watched a doccie a few years back which showed Tasmania in Australia is the largest supplier of legal heroin, and I think Spain is a major grower as well. But poppies are legally grown here in the UK, too. They supply the NHS with enough heroin for diamorphine, which is used for palliative care, not just for addiction treatment. My brother’s mother-in-law was prescribed some when she was terminally ill. It isn’t unique, I think Canada has a similar programme and a few other European countries, including Morty’s home country.