Orly Airport Attacker Was Obviously "Under the Influence"--But of What?

The father of the attacker (who was killed) blames his son's act on weed and booze--but is that what's really behind it? (my bolds):

The father of the French man shot dead at Orly airport in Paris after attacking a soldier said on Sunday his son was "not a terrorist" and that his actions were caused by drink and drugs.  

"My son was not a terrorist. He never prayed and he drank. This is what happens under the influence of drink and cannabis," the father of Ziyed Ben Belgacem told France's Europe 1 radio.

Ben Belgacem triggered a major scare at Orly international airport south of Paris on Saturday morning when he grabbed a female soldier on patrol and put a gun to her head.

He seized her assault rifle, saying he wanted to "die for Allah" and kill others, before being shot dead by the soldier's two colleagues.

The attack came around two hours after Ben Belgacem, who had several convictions for armed robbery, fired on police after being pulled over for speeding after spending the night in a bar. ...

Weed and jihad--isn't it possible to be high on both?