This doesn't look right - why do drinking patterns follow some state borders like that? Culture doesn't vary sharply across state lines, and state laws regarding liquor aren't that different...
The map leverages data from the latest annual datasets of the CDC’s Behavioral Risk Factor Surveillance System and the County Health Rankings & Roadmaps (CHR&R) program.
Is this a combination of several separate sets of data (e.g. one for Texas and another for Oklahoma) which had different methodologies? Why else is Oklahoma (including its narrow panhandle) so different from both Texas and Kansas?