Recreational Drug Use
My CASA doc told me of a young fellow last year who, like most budding pilots, wanted to fly since about the age of 4.
He, like you, took some drugs which he disclosed to the CASA quack during his pilot medical and was told he would NEVER hold a licence because of his poor decision making.
The reason is that the substances are addictive and you and CASA will never know if you are going to be tempted to take them again when next you feel under pressure.
Sorry Mate!!