Cannabis and Brain

I am 22 years old.I've been a regular
user of cannabis(hash,skunk etc) for four years now,but I have
reduced smoking a lot,almost quit it,
since last summer.I would like
to know if my IQ and all cognitive functions
of my brain have been affected negatively in the four year period
I've been a user, even if the impairment is subtle.If
your answer is yes the loss is permanent or cognition returns
in the initial status after reduction or cessation of use?
I ask this because when I fail to come up with a
solution to a problem I believe that cannabis use
has caused irreversible effects to my intelligence and personality.
As a result,I feel depressed and nostalgic
with my old self, before I start smoking cannabis.
Answer me if cannabis use reduced my mental skills
or is it my idea and what should about it?Please reply.

Read what our expert Wndy Moelker has written about Cannabis use!