I'm not sure we can take the results of a single experiment in an incredibly homogenous tiny country in Europe to mean an outcome is replicable across the world.
While Portugal is probably the most famous example of decriminalizing working in humans favor, it's not the only example, it has been employed in other states too. Netherlands has de-facto decriminalized all drugs (in practice, not in law), Czech Republic has decriminalized all (most?) drugs as well.