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Fresh cannabis plants are around 80% water (all %'s by weight); curing generally begins after the cannabis has lost half of it's initial mass, and contains approximately 33% of it's initial water.
The reason for marijuana staying in your system for so long is that THC is fat-soluble. This means it ends up being stored in your body fat. When your body burns those fat cells later, the THC is released and ends up in your urine. The more you smoke weed, and the heavier you are, the more THC will accumulate.