...Motohiro Nakajima; Mustafa al’Absi Background: Fasting changes mood and physiological states. Substance use, such as khat use, is prohibited during fasting during Ramadan, a traditional practice among Muslims. Habitual khat use is associated with increased negative affect and altered...

...Richard Hoffman; Mustafa al’Absi To date there are very few laboratory data available regarding the long-term effect of the psychostimulant khat on human neurocognitive functioning. The purpose of the present study was to assess whether chronic khat users would demonstrate impairments in working...

...Stephan Bongard; Mustafa al’Absi; Najat Sayem Khalil; Molham Al Habori Khat ( Catha edulis ) is a widely used stimulating drug often consumed in daily routine in Yemen and East African countries. Chewing khat acutely elicits states of euphoria and feelings of well-being which later shift...