Do states have to respect other states laws regarding medical marijuana or a better question can I smoke using my card from California inside of lets say Maryland?

No, states are not required to respect each other's laws regarding medical marijuana. While California may issue a medical marijuana card, Maryland does not recognize it, and using marijuana in Maryland, even with a California card, is illegal. Each state has its own regulations, and possession or use of marijuana remains a violation of federal law. Therefore, it's important to adhere to the local laws of the state you are in.