The IRPC and its co-founder Maria Papaefstathiou invited 50 designers from 27 countries to participate in the first Cannabis Poster Exhibition. 43 posters were submitted and were exhibited at the BALKANNABIS EXPO in Athens, Greece, on June 1-3, 2018. The EXPO is an international trade fair and conference on medical cannabis and hemp applications. More than 120 exhibitors and 30+ world-renowned speakers convened at the event.

The main goal of the Cannabis Poster Exhibition was to raise awareness of the healing properties of the cannabis plant and its many uses.

