But since you're asking for reasons to smoke
* If you want to do drugs, weed is probably the safest one to do. Considering that no one has ever overdosed on smoking or consuming too much weed. EVER
* You'll feel amazing.
* Everything feels enchanced.
* It's calming and medicating.
Most tales you hear about the after effects or side-effects of cannabis is bullshit. I've never experienced lowered brain activity, drowsiness/lazyness, etc. after my high is gone, but it may vary from person to person. It might enhance anxiety or paranoia but again it varies a lot from person to person. But really there's nothing to be concerned about when smoking weed other than addiction, but hey... Smoke weed erryday.
That's basicly my advice.