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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.
If you consistently smoke marijuana, it will take approximately 2-5 weeks to get out of you system. It all depends on body chemistry (how fast your metabolism is, body weight, physical condition, etc). The average time it takes for a 180 pound, male consistent marijuana smoker is 30 days. There are numerous supplements out there that claim to get marijuana out of your system, but once again, it all depends on body chemistry.