Which is more dangerous in the hands of an otherwise law-abiding citizen?

[Lunar]

Obviously the joint is totally free from any 'dangerous' aspect at all

You should see some of my friends drive high.

I doubt they can drive sober, so obviously intoxication doesn't help.

I think both marijuana (and heroin, but that's another story) and assault guns should be legal, but not for medical or safety reasons.  However, a moderate dose of tetrahydrocannabinol (marijuana) has almost no chance to result in serious injury unless one simultaneously engages in extremely risky behavior that would be dangerous without it, say, flying stunt aircraft or driving recklessly.

If anyone wants to argue that marijuana is a dangerous substance, I'll answer every point you throw, haha.  You can follow the link from my last thread started (profile - Jail thread) and read me and Dazzleman debating drug legalization if anyone's curious.

[Lunar]

I say marijuana because although you may be a lawabiding citizen, being high can make you do crazy stuff you would never have done because of your now lowered inhibitions. 

"A" joint means that we're not talking about intensive amounts of marijuana or any amount that would place even an inexperienced user out of control.  Even if it was extremely potent, the user would probably feel more slothful than anything afterwards.

[Lunar]

A joint--that distorts your vision, and could lead to:
a) Car accidents
b) Misuse of a legally owned hand-gun
c) Harming yourself/suicide
d) Harming others
e) Mentally harming yourself--definite

while a handgun, is an if--if someone finds it and accidentally shoots it.

One joint dose what now?  You're extrapolating the symptoms an awful lot.  The visual distortion isn't substantial unless you start doing much more than what's commonli percieved as one dose.

To me, this is like asking what's more dangerous: Two beers or a gun?  In order to make either of them dangerous you have to combine them with another dangerous activity.