It is not mandatory for consumption, but that is not the problem anyway. The problem is that actual crimes are done while under the influence and in that situat

It is not mandatory for consumption, but that is not the problem anyway. The problem is that actual crimes are done while under the influence and in that situation the court will give out mandatory participation in rehabilitation. If you fail to do so the court’s social services will advise the judge for other measures. If you think of it nobody bothers with alcohol consumption but if you have an accident under the influence of alcohol it is pretty reasonable the judge prescribes AAA participation, instead of just punishing you. Failure to do so can then lead to the judge finding you guilty on more severe charges like involuntary manslaughter or just plain contempt. Of course crimes related to heavy drugs are often much more severe so if you don’t play nice you will go to jail and not come out for some time. Portuguese prisons are also overbooked and known for being very miserable.