Reciprocity in the cannabis world refers to medical cannabis reciprocity, which provides the ability for medical marijuana patients to use their medical marijuana card in another state. States that honor medical cannabis reciprocity allow medical patients to purchase, possess, and use medical cannabis in their state if they show their medical cannabis card from their home state.
Every state has different laws, even in states that have legalized medical and recreational cannabis. Do not assume that just because you have a medical marijuana card, you are protected in any other state that you travel to. In fact, states that have not legalized marijuana have the right to charge you with possession and possibly a felony, even if you have a medical marijuana card in another state. Learn more about which states allow medical cannabis reciprocity, and make sure you know the laws in any state you travel through or to before packing your weed and your medical card, assuming you are protected.