Everything can become an obsession.
Lucid dreaming is no exception.
Example: many people are religous bot some are religious EXTREMISTS. They become terrorists or they begin screaming to people at a specific forum that they are very bad atheists.
But, oh, sorry, that's another thread.
I read in a Dutch scientific article about LD that there ARE people who never get out of bed anymore because they want to LD the whole day.
I'm sure this has nothing to do with the lucid dreaming itself, we talk about very weak personalities who could be obsessed by anything.
This is not about a chemical addiction, like nicotin or heroin, it involves a psychological addiction. The object of a psychological addiction can be everything, so the object can hardly be blamed