Determining how many new patients will register for medical marijuana programs before dispensaries open can be a headache for execs in the cannabis industry.

As a recent chart from the Marijuana Business Daily analyzing the trends in three states indicates, the growth rates for registration can be all over the map.

That said, columnist Becky Olson reports that more patients in each of the markets did join the MMJ program leading up to the launch of dispensaries. Check out the chart below, and MBD's full analysis here.