There are short-term effects, including inability to function and be mobile, loss of judgement, gnawing hunger and so forth.
In addition, there are long-term effects. You can read them, below.
No.
Marijuana is a drug. So yes, by definition, it affects you.
Marijuana may cause memory loss.
It doesn't
YES
it doesnt
it doesn't!
Yes
Yes
I think it can.
By smoking it...
Yes it does.