Two European projects are looking for the keys to be able to use cannabis as a drug. The effective and safe therapeutic use of marijuana involves investigating the effect of its active ingredients on human perception.

In almost all European countries, one of the active ingredients, cannabidiol, or CBD, is legal. But, in most cases, cannabis for personal consumption is not legal, although medical marijuana is increasingly widespread on the continent. Some cannabis compounds are believed to help relieve depression, anxiety, addiction, chronic pain, inflammatory diseases and nausea associated with chemotherapy.