When French police raided a hotel room earlier this week that had been used by the ISIS terrorists who killed 129 in Paris, to their surprise they found used syringes, needles and plastic tubing.

The evidence found suggests that during their assault on Paris last week, ISIS gunmen were likely high on a very addictive drug known as Captagon. It would also support statements made by many survivors of the attack that the killers appeared to be "zombie-like" during the violence.

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"You can't sleep or even close your eyes, forget about it," a Captagon user from Lebanon said in a documentary for BBC Arabic that was broadcast in September. "And whatever you take to stop it, nothing can stop it."

Others users describe the effects of the drug as feeling like they "own the world," and have "power nobody has" and "there was no fear anymore," according to the documentary.

One former Syrian fighter told the BBC said the drug is ideal for war because of its ability to give soldiers superhuman energy and courage.

"The brigade leader came and told us, 'this pill gives you energy, try it,' " he said. "So we took it the first time. We felt physically fit. And if there were 10 people in front of you, you could catch them and kill them. You're awake all the time. You don't have any problems, you don't even think about sleeping, you don't think to leave the checkpoint. It gives you great courage and power."

Captagon is a brand name for Fenethylline, which was first created by Germany's Degussa AG in 1961, and had been used for about 25 years as a milder alternative to amphetamines. It was given to people suffering from hyperactivity, narcolepsy and depression, but by the 1980s, most countries banned the drug due its addictive properties.

"There's a great deal of trafficking being done of all sorts of illicit goods - guns, drugs, money, people," Masood Karimipour, a representative for the U.N. Office on Drugs and Crime (UNDOC) told Voice of America. "But what is being manufactured there and who is doing the manufacturing, that's not something we have visibility into from a distance."

According to a report published last year by Reuters, the Syrian civil war has turned the country into a "major" amphetamines producer and consumer.

"Syrian government forces and rebel groups each say the other uses Captagon to endure protracted engagements without sleep," Reuters reported. It added that "ordinary Syrians are increasingly experimenting with the pills, which sell for between $5 and $20."

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