Okay, phew, now that I've gathered that you are trying to ask me why I smoke cannabis, I will answer:
It helps me to relax, I find it fun, and It's cheaper than Beer...
As for the "Scientists are discovering more and more about the drug", thing, have you noticed how a lot of what they have been discovering recently contradicts things they've said before? That's because of the sheer variety and unreliability of these sorts of laboratory tests. How can we know what to believe and what not to believe?