no, quite the contrary, one of the many uses for medical marijuana is to cure glaucoma.
Mangekyo Sharingan causes you to lose your eyesight.
I say you would have to lose half of your blood to lose consencnes, not sure about eyesight
never
No
No
the darkness??
You will lose that heightened response in due course of time. This is the normal course of action. There can be exceptions to this.
NO.
yes you can
there is no physical withdrawal, but there is mental one that can cause irritability ad difficulty sleeping.
no
No.