I would ask your doctor. Honestly they should be able to tell you. I suppose if you want to be safe don't smoke the day before or for a few days after.
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.