Of course magic is a drug, it’s the power to do anything you want, for Regina it did give her freedom like her mother said it would, albeit not as her mother intended.
I think Cora is the main evil, I think she’s not really going to “help” I think she wants to piggyback with Emma and Snow so she can get to Storybrooke and get Regina.
I can picture an epic scene maybe the very final episode ever where Cora goes to kill the one thing Regina loves again (Henry this time) and Regina gets in the way and is killed saving her son from Cora proving she truly loves him and while she’s dying telling Henry she loves him and Henry saying for the first time that he loves her too, she smiles finally realising she has true love and is truly loved and then closes her eyes and dies. I just think this because thinking about the final episode, doubt it can end with the charmings and the evil queen all as one happy family. Plus I think they will build it up so we are all truly sad if/when the Evil Queen dies.
Not sure it would happen, I still think the writers missed a great opportunity in the end of Season 1, Regina should have been the one to kiss Henry, not knowing it would be the true loves kiss that breaks her own curse, it would have been so ironic.