To note, smoking of weed is NOT allowed ANYWHERE on the ship. To many (me! me!) it's gross. You wan't to F* yourself up without messing up the air that other people have to breathe, then go for it. Shove that $..t up your nose, swallow a gummy, whatever, but the minute you put your weed smoke in the air it's now my problem. I'm expected to inhale that air so that you can get an (illegal at sea and violation of MSC rules) buzz on. Gee thanks.
In addition, smoking (cigarettes or doobies) in a cabin in a violation of the no open flame rule as well as jacking up the cabin for the next person.
I have found it to be a BIG issue in the YC and agree that nothing is being done about it.