Hi Richie-Rich,
I'm sure we all respect the concern you show for your friend. Perhaps you should tell him that cannabis and magic mushrooms are classed as narcotics and that he needs to be clear of them for two years before seeking medical clearance to fly as a commercial pilot.
Quite apart from the public safety issue it wouldn't be good for him to spend money on flight training only to lose his licence and job in later years if the drug problem occurs.
Issues of insurance liability also have to be thought about. I.e. if he were to lose his licence due to an undeclared previous drug problem would he receive loss of license benefit?
If you are still thinking that cannabis and magic mushrooms are not narcotics then I suggest you do an internet search on the subject or perhaps ask a doctor.
Regards,
Spartacan