Let me add the Dutch perspective, where there is no added incentive for smoking weed. We don't rebel if we do it, nobody cares.
In my experience tons of people in the Netherlands smoke weed, for a while. There's a pretty much clear-cut scenario that everyone that starts smoking weed goes through.
- You feel bored with life, you worry a lot about stuff you don't really believe is worth worrying about.
- You smoke a joint and you stop feeling bored, you stop worrying.
- You slowly adopt the habit of smoking whenever you're bored or worrying.
- You eventually get to the stage where pretty much everything you do is considered boring or worrisome.
- You start smoking weed full-time, you are stoned 24/7 and can still function well enough to get by in society.
- You do this for about three months until for whatever reason you accidentally sober up for a day or two.
- You look back at the past three months and realize you probably only have a few minutes or so of memories worth remembering.
- You realize that you hardly worry anymore about the things you used to worry about.
- You realize that you do want to have the ability to care about things you actually want to care about
- You find a new and better calling in life, you start smoking less and less until you quit it completely.
In my experience the duration of your habit is largely dependent on how long you wait with going through step 5/6/7. Therefore I advise anyone to get there as quickly as possible.
If you are a parent and want to get your kid off of weed, give them pocket-money to live on, as much weed as they could possibly want, a room where they can always smoke, lots of snacks, allow them to drop out of school and smoke weed with friends and within half a year you'll have a healthy, motivated young man far less susceptible to drug addictions because he realizes he's just wasted half a year or so of his life and is determined never to make that mistake again.
That's why I love weed, it's the safest drug for being permanently high on and experiencing what means to be permanently high is the best antidote to addiction.