All I read was the title, I can't be bothered with what I assume are 60 posts worth of bullshit. There are no good reasons why not to smoke weed, at least a few times in your life. You probably won't get high the first time, I didn't, but every time after that is smooth sailing.
If for no other reason I would suggest smoking weed just to access that area of your brain that has most likely yet to have been explored. The second you let that THC into your brain it's like a golden key unlocking a door to infinite knowledge that's just been sitting in your brain waiting to be unveiled.
Smoke the Weed, gain the knowledge, conquer the world.