Drugs are bad for you, Cannabis is not a drug!
It's a mind altering substance, a chemical that affects the nervous system, and is therefore a drug. There's also nothing wrong with that, though it likely won't help you in dream recall.

Although, by that definition, someone really ought to launch an investigation into Fruitopia.

New topic: The Effects of Fruitopia on Lucid Dreams.
Subtopic: But Wouldn't That Require Sleep?