They are filled with salt nicotine vape juice that allows them to deliver high doses of nicotine without the unbearable throat hit that would come with freebase nicotine in similar concentrations. This allows them to deliver nicotine faster much like a cigarette and more rapid transition away from smoking.
Virginia Rich unmistakable American tobacco
Menthol Traditional menthol flavor with a brisk finish
The FDA has required all vaping products to file a PMTA as of 09/09/2020 in order to remain on the market. Juul has not filed a PMTA for their once popular Mint Juul Pods, or any of their other discontinued flavors. Thus those flavors are no longer available for sale in the United States at this time.