Joseph Mellen discussed his journey in the controversial book ‘Bore Hole.’
Mellen drilled a hole in his skull three times to remain permanently high.
The procedure is called trepanation, one of the world’s oldest operations, as Oddity Central reported.
There have been many cases where trepanned skulls have been found worldwide, but Mellen is one of the few people on the planet to participate in the procedure.
He reportedly learned about trepanation in 1965 from his colleague Bart Huges, who also shared a similar enthusiasm for psychedelic drugs such as acid. Mellen attempted the procedure in 1967 but couldn’t afford an electric drill because of his financial circumstances at the time.