Have you heard of molly? Molly is the nickname for the purest form of MDMA or ecstasy.

Flickr User Kadluba

A highly popular drug in the 1990's rave scene, its reemerging as a common party drug for students in New Jersey.

She sounds like the girl next door, but Molly is far from innocent. Because the chemical make up of the drug is often altered, taking it can lead to a host of health problems including seizures, cardiac episodes and comas.

"There is no consistency in the make-up of the drug so it could contain substances that are really unknown," said Linda Surks at the National Council on Alcoholism and Drug Dependence of Middlesex County.

She said pure MDMA releases serotonin that can have a happy and euphoric effect on users, but there is no way to tell if the pills are pure unless they are tested.

"Its like playing a game of chance...you have no idea what's in it until you take it."

In most cases, molly users are young, between the ages of 16 and 24.

"I haven't done a formal poll across the state, but we have heard that it's made its way into New Jersey schools...I heard from Carteret, I spoke to a police officer in Spotswood, its in our communities. It is being marketed to teens and middle-school students as a party and club drug."

From 2004 through 2009, health officials say there was a 123 percent increase in the number of emergency room visits involving molly or a combination of molly and alcohol or other prescription drugs.

"It can be a very dangerous substance and its right here in our state" added Surks.