There are different theories about the relationship between the Templars and ingesting cannabis.
In the book “Green Gold: the Tree of Life, Marijuana in Magic and Religion”, it is conjectured that hashish came to Europe via the Templars as a result of their trading activities with the Ismailis in outremer.
The warriors of the Ismailis, who defended their faith against Sunni rulers, were the famous ‘Assassins’. These fearless killers struck at their enemies in such a way that their bravery was often ascribed to taking hashish and that was where their derived from. Hashishin = Assassin.
Not so says Amin Maalouf who says the word Assassin means ‘followers of the foundation’ and has nothing to do with ganja.
But Robert Anton Wilson in his book ‘Sex and Drugs’ recounts the familiar line that the courage of the Assassins must have been influenced by narcotics and that there is evidence the Templars partook of the wacky backy. At the very least to relieve pain.
One must mention the Sufis, the Islamic mystics often said to have influenced the Templars. They worshipped a Golden Head and the Templars worshipped the head of Baphoment and therefore, they were all off their heads. Dope produced that higher level of enlightenment that mead and ale was could never hope to.
I can only hope that when Jacques de Molay faced the fires outside Notre Dame in 1314, he did so with the benefit of several pints of Stella Artois and a big long spliff. How else to endure that public agony?