Ibn Sina (Avicenna) is primarily known for his philosophy and medicine, but there is almost no scientific discipline in which this great man didn't leave a significant mark. This paper gives a brief overview of his contribution to medicine and psychology through which his unique scientific and religious approach to the study of the phenomena of human being can be best seen. Medical works of Ibn Sina represent a pinnacle of most important medical achievements of his time. These works contain synthesis of all Greek, Indian and Iranian medical schools, but also new breakthroughs achieved by Muslim scholars through their own experimentation and practice. Although he wrote many medical works, his most important one is El-Kanun fit-tib, which can be translated as The Canon of Medicine. It's made out of five books which systematically show everything known in the area of medicine up until that point in time. In it, Ibn Sina discusses, among other things, the structure of psychological apparatus of human being and the connection of psychological functions with the brain. He considered psychology to be very important for medicine, so in his psychological works he discusses, in great detail, the essence of human soul, consciousness, intellect and other psychological functions. He observed a man in his entirety, taking into consideration all aspects of his existence, paying special attention to spiritual knowledge and spiritual perfection, religiosity, and methods of achieving inner peace and well-being.

BACKGROUNDS Written historical evidence reveals that Cannabis sativa has been used medically, recreationally and spiritually for more than five centuries in many cultures. It is considered the most-used plant-based psychoactive substance with millions of different usages across the world. To review what the studies, conducted over the past two decades, indicate about effects of the cannabis on physical and mental health as well as the impact on social functioning. METHODS We selected literature review using PubMed resources, to summarize the findings of the existing publications on cannabis and cannabinoids and their possible psychopharmacological therapeutic effects only. RESULTS Research supports cannabis' clear acute effect on neurocognition, while non-acute effects for prolonged use of marijuana are unclear and still insufficiently explored. Due to cannabidiol's (CBD) safety and tolerability, the absence of psychoactive or cognitive effects, the existence of clinical trials with positive results and its broad pharmacological spectrum, CBD is a cannabinoid whose initial results will likely lead to implementation into clinical practice. The fact that the results of previous studies establish the claim of CBD as an antipsychotic and anxiolytic, makes the above developments even more likely. However, long-term, double-blind, placebo studies with samples of patients with different psychotic and anxiety disorders are still necessary. Likewise, due to CBD's biphasic effects, determining an adequate therapeutic dose remains a challenge to conclude, the cannabinoid system represents a promising target for new therapeutic interventions in psychiatry. CONCLUSION Further controlled studies are essential to determine the precise mechanisms of action of cannabinoids on various neuropsychiatric disorders as well as the safety of their use are needed. Never just the use of 'smoking cannabis in an unlicenced way'. The use of simple 'smoked cannabis' remains dangerous because of the effects on inducing psychosis which the article itself refers to, and needs to remain illegal.

Ibn Sina (Avicenna) is primarily known for his philosophy and medicine, but there is almost no scientific discipline in which this great man didn't leave a significant mark. This paper gives a brief review of his contributions to medicine, especially to psychiatry. Medical works of Ibn Sina represent a pinnacle of most important medical achievements of his time. These works contain synthesis of all Greek, Indian and Iranian medical schools, but also new breakthroughs achieved by Muslim scholars through their own experimentation and practice. Although he wrote many medical works, his most important one is El-Kanun fit-tib, which can be translated as The Canon of Medicine. It's made out of five books which systematically show everything known in the area of medicine up until that point in time. In it, Ibn Sina discusses, among other things, the structure of psychological apparatus of human being and the connection of psychological functions with the brain as well as the role of psyche in etiology of somatic diseases. He also describes certain psychiatric diseases along with the explanation of their etiology and recommended therapy. He considered psychology to be very important for medicine, so in his psychological works he discusses, in great detail, the essence of human soul, consciousness, intellect and other psychological functions.