I think something happened during Smoker's childhood that affected him a lot. He admired Roger, and his disillusionment with the pirates after the death of the Pirate King was enormous. He seems to have joined the Marines precisely because of this.
If his name isn't real, we have several options.
Actually, if Smoker joins the strawhats, he must have a real name. After all, Luffy calls the members of his crew by their names without distorting them. Perhaps Smoker would reveal his identity before joining the crew, and then Luffy would call him by his real name for the first time. And Smoker will talk about his dream, and Luffy will talk about his in return, and at that moment we will know Luffy's real dream.