Schizo while on drugs

21 (M) have experimented with heavy drugs such as cocaine, heroin a few times, heavy alcohol abuse, and other prescription drugs of sorts. Not too long ago while taking cocaine, I started hearing voices and feel as someone is watching me. This became everytime I ingested cocaine. I even took month breaks from coke to see if it was just my mind playing games, but they came right back. And a sense of thinking everyone is against me. Is this paranoia or early signs of schizophrenia ? Does this happen to other people ? No family history of mental illness known