Mackenzie also writes of being taken to a hospital after a miscarriage during her relationship with then-boyfriend Peter Asher.
Mackenzie was the daughter of the 1960s San Francisco balladeer John Phillips and his first wife, Susan Adams, an East Coast blueblood who was a descendant of President John Adams.
She was so addicted, she stole some cocaine from singer James Taylor to take on the trip, she says.
He did have one boundary.
But be forewarned, they are not safe for work.