My thought is that drugs may expedite spiritual growth by forcing you to face your demons or triggering spontaneous visions/inspirations, but that most often drugs are advocated by users because drugs are coping mechanisms and advocating them helps users improve or maintain their self-image.
So, I respectfully disagree. While Terence McKenna and similar writers have interesting conjectures and it’s certainly possible that some substance users may find some sort of enlightenment through such substances, I feel that there’s very generally little real difference between someone who drinks alcohol and someone who uses something illegal. Just another port in the storm, needed by ships that aren’t well prepared for the rough seas of life.
I highly suggest meditation as an alternative.
I hope you have an awesome day too, amigo.