Generally, legality of THC cartridges varies by jurisdiction, and most states have their own laws, but cannabis plants and their use are still not federally legal. In some places where recreational or medical cannabis is legal, THC cartridges can be purchased from licensed dispensaries. However, it's essential to familiarize yourself with the specific laws and regulations in your area to ensure compliance. You can look out for all the options of "diet weed" or "weed lite", like hemp and Delta 8 products, as they may have their own legal laws in different states.