This is a subject which I feel I have to post on, there is a tolerance to THC, but not in the same way one becomes tolerant to an opiate, or another drug such as a benzodiazepine.
The problem may be that you are smokinh high THC content weed, and not getting any variety, because you could get stoned on canabis every day for life, the same way even with the tolerance, though I agree that the high is better after a break.
However, if you are a daily smoker, then it helps to get variety, perhaps a bit of hashish from India/or the middle east, with a higher CBN content and high THC content, and enjoy the narcotic type high of that, then go for something like an african hashish with more THC, and a different production method, which will give you a more trip like stone. Then at the weekend's or when you can break out the high THC Nederweeds, and I guarentee you, tolerance will start to play a lot less of a role.
Remember nearly every weeed from every part of the world is different, and tolerance will really apply when you start smoking Nederweeds on a daily basis, but even then, you should still be getting very high, though it's possibly your mood and the setting that is affecting the high.
If it feels like a psychological addiction, then of course the high is going to be different, as the mind first feels the relieve then the craving for more, and this can greatly affect the effect of the various active components in hashish or MJ. As a psychedelic, moood, setting, expectation, everything you apply to any other psychedelic plays a very large role.
This is just an opinion, but as someone who spent time in amsterdamn smoking daily, I can tell you, tolerance is highly overrated when it comes to cannabis. There is of course tolerance, but it doesn't play as much a role as the mind's expectation itself. Scientifically too, there is no conclusive evidence that tolerance is playing a huge role either, as someone can smoke alot one day or for a week, and then be wasted after one smoke after work. Also if it acted like any other drug in tolerance, then the drug would have no effect no matter how much you took, and this doesn't happen with cannabis, because of the way it works.
Varaying the type of smoke you are smoking will help immensly.
