Questions about marijuana?

I would look out for the following

-Using 24/7

-Being high while at school or otherwise non free time

-dropping grades

-spending money that he doesnt have, or stealing money to get it, or bartering things that are of far more value or could get him in trouble for not having (like if he trades his 600 iphone for a couple joints, that kind of thing)

-moodiness when not high

I would not worry about paraphernalia. Many people who use responsibly have paraphernalia.

It's a problem when he moves onto heavier drugs. If he doesn't do that, honestly he should be alright, despite all the negative press you see about weed. If he's doing it in his own home and not doing it while driving or anything he should be fine.

Sometimes marijuana can bring out bad things in people, like paranoia or worsening mood/mental issues, so if you see any of that then you might want to try and help him out, but if he's happy and relaxed and you have no reason to believe he's into anything more serious it should be alright.

it's only good to do once in a long while like once a month and you'll be fine

Bongwater: You CAN get addicted to weed. My friend was addicted to it. How about YOU research YOUR stuff before giving FALSE info that can lead people to smoking it. Stop saying that stupid myth that weed isn't addictive. IT IS. NO way around it.

smoking weed daily is too much every 3 days or so is cool.