The organization sponsoring the most polls is the Marijuana Policy Project at thirteen. However, these thirteen include the recent Ten State Poll. Other organizations that have sponsored multiple surveys include KUSA (Denver) and the Lindesmith Center.

Research firms who have conducted multiple studies include the Lucas Organization (13, all for the Marijuana Policy Project); Survey USA (5, all for KUSA Denver); Fairbank, Maslin, Maulin & Associates (3); Mason Dixon Research (3); Princeton Research Associates (2); and Zogby International (2).