brownie questions

I want to experience pot brownies and i have a few questions.

1) If you ate the same amount of pot that you normally smoke, would you still get as high? or does it take more when you eat it?

2) Would it work just fine if I just used some regular old brownie mix and then just added the stuff?

3) Do they go bad? Do you have to eat them soon after they bake or can you wrap them up and eat them like a week later?

Thanks for any help I get.

** This probably doesn't belong in this forum but stuff never gets seen in the other ones it seems **