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I didn't get very high when I smoked, either, and I attributed it to the fact that I wasn't smoking enough, but my sister, who smoked the same amount, was flying. It may just be a difference in your brain chemistry.
I read a depressing fact a couple of weeks ago about long-term cannabis use that I'll try and dig up. It said that the longer people smoke, the less they get the desired effects from cannabis. That is, the highs get lower, and the other thing it said was that, after years of smoking, the negative side-effects (like coughing or irritation or maybe even forgetfulness) get more noticeable.
Maybe take a nice, long, three-month break and see if that helps. If it doesn't, try hash or something stronger.
Well of course the "desired effects" become diminished after a period of use because you gain tolerance. I've never heard of a tolerance free drug anyways, but it's a good thing that it's not permanent. You simply need to take a "tolerance break." You say you smoke everday so I would recommend taking a week off. By the end of the week it will almost feel like your first time, for me it does at least. Good luck:rasta: