I don't know why people think weed is the sure bet. All kinds of fucked up shit going on in that industry (see MedMen, Canopy, Select/Cura)... Until shit goes federal, it is very difficult running multi state licenses under a single banner. Too many different laws and regulations state to state, makes it very difficult for those multi state license holders (why MedMen is selling licenses in 3 states currently).
Also, over taxation and regulation is killing the industry in Cali. Only 25% of the weed being bought is thru dispensaries and being taxed. The rest is on the traditional markets.
People are catching on and don't want to pay $60-$80 an eighth for some dried out, tasteless mids in a shiny mylar bag that was harvested a year ago and sitting on shelves for a few months. They rather go to their old homie down the block with the turkey bags of fire.