Michigan authorities say several seizure-inducing overdoses have been traced to a synthetic cannabis solution used in e-cigarettes. The solution is known as “Darth Vapor” and has been suspected in four overdoses by teens in Michigan.

“We’ve had four confirmed overdoses or poisonings — whichever one you want to call it — of individuals…all teenagers,” said Mason County sheriff Kim Cole. “It is deadly; people need to understand these will kill you.”

Officials warn “it’s just a matter of time” before someone dies as a result of a drug overdose on “Darth Vapor.”