Ok, i believe that you are alowed to grow up to 3 plants in most states of Australia except for victoria and maybe NSW where u cant grow any, but in western Australia you can grow up to 7 plants and you are able to consume this on your own private property.
When i was still in high school we had someone come and talk to us about drugs and he said that.
There are also places like nimbin in NSW that is basicle like ampsterdam, although it is still illigal you can pretty much openly buy, sell and smoke it on the street and the cops dont care at all. Google Nimbin if you dont believe me .