"There's a generational issue going on," he began. "I've experienced mental health issues my entire life. I had obsessive compulsive disorder -- having to count out certain actions before I went to bed at night, obsessing over things. I didn't sleep very much as a kid."
"I had really bad insomnia, a lot of energy and a racing mind and I inherited that to some degree," he added.
To help "calm" his inner thoughts, Zak said he began to rely on alcohol and drugs during his teens, which would eventually become a "very normal experience."
"It just became part of my identity," he explained. "I'm just like, 'I can do this so I can get through the day.' And the weird thing for me, I would take uppers. I would take cocaine and the like to calm down. I talked to my dad about it -- he was similar. He would use uppers as a way of focusing and relaxing."