Here is an excerpt from ETWOLD(page 29):

Q. Might lucid dreaming be dangerous for some people?

The overwhelming majority of lucid dreams are positive, rewarding experiences, much more so than ordinary dreams(to say nothing of nightmares). Nevertheless, there probably will be some people who find the experience of lucid dreaming frightening and, in some cases, extremely disturbing. For this reason we cannot recommend lucid dreaming to everyone. On the other hand, we are confident that for people no more than "normally neurotic", lucid dreaming is completely harmless. Different people will use lucid dreaming for different purposes; it makes little sense to warn the typical explorer of the dream world away from lucid dreaming because some people might use it in a less than optimal manner.

If, after reading the first 6 chapters of this book, you still have serious reservations about lucid dreaming, then we recommend that you not continue. "To thine own self be true." Just make sure that is is really your self to which you are being true. Don't allow others to impose their personal fears on you.

Quote Originally Posted by Shift View Post

If he were to say something like "Unhealthy depressed people will flock to lucid dreaming to utilize it as an escape mechanism" then I'd agree