By Alexis Tereszcuk - Breaking Celebrity News Senior Reporter

Demi Moore’s frantic 9-1-1 phone call has shed more light on the night she had a seizure and was rushed to the hospital, and it may have also revealed the substance that she was smoking.

As Breaking Celebrity News previously reported, a friend of Moore’s can be heard on the call explaining to the operator: “She smoked something, it’s not marijuana, it’s similar to incense. She seems to be having convulsions.”

Demi Moore 911 Call: ‘She’s Convulsing’ And ‘She Smoked Something’

A likely possibility is that Demi was smoking K2 Spice, a “currently legal herbal incense product spiked with powerful designer drugs” that don't show up in tests, according to WebMD.

Breaking Celebrity News spoke with addictions specialist Dr. Phil Dembo, who said judging by the description on the 911 call, he believes Moore was smoking K2 Spice, which is currently legal in the U.S. but under investigation by the Drug Enforcement Agency.

“It sounds like Demi smoked K2 Spice,” Dr. Dembo, who has not treated Moore, said.  “The problem with synthetics of any kind is they can cause anxiety or depression and cause panic or hyperventilation type of experience. There is racing of your body and those things chemically take you over.”

According to Hunterdon Drug Awareness Program, “The terms Spice and K2 refer to commercially available products that have been sprayed with research chemicals called synthetic cannabinoids but do not contain any cannabis (marijuana) components.