[quote=@Legend]
<Snipped quote by souleaterfan320>

It shrinks the frontal lobes.

<Snipped quote by DarkwolfX37>

That's not how it works.

<Snipped quote by DarkwolfX37>

He doesn't have any Codex as far as I'm aware.
[/quote]

Not true. The worst that can happen is it can >possibly< make certain problems worse, and >possibly< lower immune system responses slightly. With it being illegal, there aren't many reliable studies on the effects. Most information, including shrinking the frontal lobe, comes from decades old biased studies done to justify the drug war on it. If you smoke it while still developing, another reason to legalize it so it can be regulated like alcohol, then it can cause some problems with brain development, but that's true of pretty much everything to some degree or another. Obviously it causes the same problems that any mental medicines do as well, ie. that the chemicals it has will affect the receptors and production of them in the brain until a while after it's stopped being used and adjusts back to having no outside input. 

As long as you don't smoke it while pregnant or breastfeeding, or while you have lung problems (if you smoke it), heart attack risks (it speeds heartrate for a while), or with seizure disorders (potentially could make it worse, potentially could make it better, as well), then it's not dangerous at all. Not to mention it's impossible to overdoes unless you like liquefy it and inject it or something insane like that.