I always want to quit, before I come down and realize that I am unacceptably insane without it. But with the right intent, even an insane person can learn to smoke less weed and benefit from doing so. Use versus abuse. It is very easily possible to be an abuser of weed, and suffer the consequences of drug abuse to your body, so it is best to just try and smoke a little weed to avoid that instead of using it day in day out. The long term side effects can take years to develop, but they do exist - the anxiety can be torture - and being complacent as a heavy stoner today does not mean you will be able to keep doing so in the future. And imagine a life without drugs. How lame is that. Health should not be taken for granted, and a vaporizer is no excuse to go through an eighth a day.
For myself, taking a break requires something to snap me out of the habit. Otherwise, I'll just keep on smoking weed. A health problem, running out of money, a major failure or defeat in life that happened when I was really baked and burnt out is usually enough to do the trick, at least for a couple weeks. However, once that catalyst is initialized, and I am past that initial burnout phase from the extended high, then taking a break from weed always comes with a lot of positives in my life. Then when I have been feeling great for awhile I usually start wanting to get high again - at which time, weed is different than it was before, I'm not as hooked for the moment, the positives once again outweigh the negatives, at least in my warped pot adoring mind, and the cycle continues. It's just the 2 weeks of physical withdrawal that make my life miserable, then after that I don't really need weed anymore (but always seem to go back to it).
The age old debate between going cold turkey, and slowly tapering off. Still haven't figured it out, probably never will. But at least I only smoke pot now and stay away from the harder shit; taking stuff stronger than weed is like shooting yourself in the foot. You never know what the side effects could be. Sure I'm still a big doper, but a few years ago I was much worse off than that and things have greatly improved since then. Even the holy herb comes with its risks to your mental and physical well being in the long term, take something stronger even a handful of times and you're asking for trouble, especially that street chemical nonsense. Even smoking too much weed all day without having respect for it or ever limiting yourself is eventually going to completely fucking ruin your life after awhile, you'll lose all your soul and creativity and focus with no easy way out, hear it from someone who has been at it for a decade. I am essentially fucked. But simultaneously, I'm still here and I'm still enjoying that herb, so what do ya do. Everyone has their issues and obsessions, otherwise you would have merged with the ultimate cosmic nature of the universe by now, and ceased the old cycle of death and rebirth. Don't take my word for it, I can't pretend to understand that shit. It's a tough life smokin' all that weed, but somebody's gotta live it. There may be some negative aspects to repeating the experience excessively, but I am still more against not smoking weed than I am for abusing it. It softens the ego, which is always a plus. It's important to be chill, and that's hard when you're a dope fiend without a nice kush and jack herer stash on hand at all times.