I'll ask again. Have you ever smoked marijuana? What makes you an expert on its effects?
I think it annoys you that I don't answer your question. :)
If I say "Yes" you can say "you're a hypocrite!" and if I say "No." You can say "You're Ignorant!". I think i'll give it a miss.
Now how about you ask me how many people that I know who smoke pot and how many of them are Worthless F**ks?
The answers are "A bunch." and "All of them."
What makes you an expert on its effects?
I dare say one can omit getting shot and still have a good working understanding of the phenomena.