Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Hooked to ventilators in hospital beds, they were on the brink of death. These shocking photos show brothers Jeff and Joey Stallings, who were placed in medically-induced comas after taking a 'bad batch' of synthetic marijuana in their hometown of McComb, Mississippi. The siblings, both in their 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. They had to be put on life support.Jeff and Joey Stallings took a 'bad batch' of Spice in Mississippi hometownHospitalized after suffering from hallucinations, sweats and violent shakingPhotos show the brothers in medically-induced comas in McComb hospitalFortunately, siblings rallied against the drug's effects and are now at homeBut Jeff has 'permanent kidney damage' and both are still addicted to drugNow, their mom, Karen, has begged others not to take synthetic marijuanaBecause chemicals in Spice vary, users do not know what they're smoking 
 Question:Unlike pot, _ can cause a huge range of symptoms, many of which can be severe.

Spice