Canadian Approach to Substance Issues

Today, the Canadian federal government announced they have agreed to a British Columbia request to decriminalize possession of small amounts of drugs for personal use. Marijuana, of course, has already been decriminalized.
Effective Jan/23, individuals can possess up to 2.5 grams, in total, of opiates, cocaine, methamphetamines and/or MDMA (Ecstasy). Anyone apprehended for whatever reason will not have that amount of "personal" drugs confiscated. Officials have gone to great lengths to clarify that such possession for personal use has NOT been legalized, only decriminalized. (I'm unsure of the difference, at the street level, but I'm not a lawyer)
Already, while the changes have been applauded by most of those knowledgeable of the drug situation, it has been criticized for establishing the 2.5 gram limit as unreasonably low: most have said the limit should be at least 3 - 5 times higher.
I wasn't even aware that our criminal code could be massaged to decriminalize something in one province that is a criminal offence in every other province, but what do I know?