Wait, what about Portugal? Didn't they also legalise it?
> If someone is found in the possession of less than a 10-day supply of anything from marijuana to heroin, he or she is sent to a three-person Commission for the Dissuasion of Drug Addiction, typically made up of a lawyer, a doctor and a social worker. The commission recommends treatment or a minor fine; otherwise, the person is sent off without any penalty. A vast majority of the time, there is no penalty.
Quote from: https://www.mic.com/articles/110344/14-years-after-portugal-...
Production and sale are still criminalised in Portugal, and possession is still considered illegal, but with no penalties to first time offenders and considered a health issue for repeated offenders.
The major difference - Decriminalisation complies with their international obligations as per signed international treaties, Legalisation does not.
State of Luxembourg thinks they will get away with that, and I would bet this has been thoroughly vetted with their international partners.