Following the approval of several ballot initiatives in 1998, Maine voters passed a medical cannabis initiative in 1999 that was significantly expanded by state legislature in subsequent years.
In the following years, medical cannabis laws were passed by state legislature in Vermont (2004), Rhode Island (2006), New Mexico (2007), New Jersey (2010), Delaware (2011), Connecticut (2012), Illinois (2013), New Hampshire (2013), Maryland (2014), Minnesota (2014), New York (2014), Ohio (2016), Pennsylvania (2016), and West Virginia (2017).