Nazi dictator Adolf Hitler was so blitzed on a mind-numbing cocktail of cocaine and methamphetamine it may have cost him the war, a new book reveals.

The irony was that the bloodthirsty dictator sold himself as a teetotaller and unleashed a war on drugs in Germany before there was a war on drugs.

According to author Norman Ohler, whose new book, Blitzed: Drugs in Nazi Germany, pulls back the curtain on the hopelessly addicted monsters of the Third Reich.

“Everyone describes the bad health of Hitler in those final days [in the Fuhrerbunker in Berlin],” he told the Daily Star. “But there’s no clear explanation for it. It has been suggested that he was suffering from Parkinson’s disease.

“To me, though, it’s pretty clear that it was partly withdrawal. It must have been pretty awful. He’s losing a world war, and he’s coming off drugs.”

As the Nazis came to power in the early 1930s Hitler unleashed a brutal crackdown on drug users, issuing an edict banning “seductive poisons.”

Junkies were declared criminally insane, dispatched to the growing apparatus of concentration camps -- or given lethal injections.

The despot blamed the Jews, of course.

But secretly, the Nazis discovered that drugs could be a key cornerstone of their fighting strategy with keeping soldiers marching longer.

On a personal level, Hitler began using his killer cocktail at the dawn of the Second World War, Ohler said.

And in the dying days of the conflict, Allied bombers pulverized the factories that made Hitler’s dope cocktail creating a very fragile and manic fuhrer.

“Hitler was physically addicted.”

He told the BBC's Radio 4: “In ‘43 and especially ‘44 he turned to opiates. His favourite drug then was Eukodol, which is a pharmacological cousin of heroin but with a much higher potential for making you euphoric.”

British historian Antony Beevor said the drugs go a long way to explaining the Nazi strongman’s colossal blunders.

“It explains a huge amount, for example in 1944, Hitler’s completely irrational planning of the Battle of the Ardennes (also known as the Battle of the Bulge), his great offensive then,” Beevor said.

“All of this was based on this euphoria, which coming from some of these drugs, the idea that one could force Britain or Canada out of the war by this attack through the Ardennes. All of these elements show how he was really no longer in control of himself, but he was still in control of the German armies.”