Cheese is a real thing in Texas however nobody actually calls it that.
cheese is just a stupid name for a mixture of tar heroin and a bulking agent; usually pills like Tylenol pm or benadryl that have DPH in them; this idiotic name was sensationalized by media outlets in the late 00's as an "epidemic of child heroin use". The article sited above is from 2007.
Despite the overblown media reports, the mixture of tar heroin and; any of the following: crushed pills, caffeine, lactose, talcum powder, baking soda is a fairly common form of heroin sold in Texas. It exists because tar heroin cant really be snorted easily but if you mix a ball of tar heroin in a coffee grinder with some over the counter pills or lactose or whatever, you get a powdery mixture of tiny chunks of tar heroin and powder. Often the tar will get coated in powder and thus can be snorted much more easily.
Many people are willing to snort heroin but not inject, so this form is very appealing to people. Especially in middle and upper class high schools you will find this stuff going around. The lower end high schools will just have strait dope. Sad but true in the lone star state.
I dont know if other areas of the country have this form of heroin in circulation. It seems too simple to be unique, however in the east coast they seem to get a form of powder heroin that is mostly heroin with some cutting agent added. Where as the texas form is mostly filler and only a small percent heroin.