Aclara Research has conducted the first study of Illinois patients since the inception of the medical cannabis pilot program. This study of 296 respondents is the first, largest and most comprehensive study of the impact of medical cannabis on patient health and well-being within the Illinois market.Aclara Research has conducted the first study of Illinois patients since the inception of the medical cannabis pilot program. This study of 296 respondents is the first, largest and most comprehensive study of the impact of medical cannabis on patient health and well-being within the Illinois market.