brothers jeff and joey stallings placed in medically-induced comas after taking a ` bad batch ' of synthetic marijuana in their hometown of mccomb , mississippi .
the siblings , both in twenties , fell seriously ill earlier this month after smoking the drug , which is a mix of herbs that has been sprayed with a chemical to produce a similar sensation to marijuana .
they were hospitalized on april 6 , within hours of each other , when they collapsed after suffering from hallucinations , vomiting , night sweats and violent shaking .