In less than a month, the Illinois Cannabis Regulation and Tax Act will come into effect. On Jan. 1, the act will legalize adult-use retail marijuana across the state and bring with it a hefty regulatory framework.As part of that framework, employers — particularly hospitals, academic medical centers and other employers subject to complex, overlapping and sometimes contradictory workplace regulations — will now be prohibited from firing employees for off-duty marijuana use, requiring an overhaul of most …