Coelho & hazedandinfused are correct.
A. You must have an empty stomach!
B. You're not eating enough.
C. You must use alcohol or a form of oil, to extract (yes, butter, or dragon)

It would not surprise me, ANYTHING your friends might do or say, just like all the people here, as there is a vast amount of disinformation.
I've seen MANY people swear they were high 5 minutes after eating, but it takes a long time, so EAT AS LITTLE AS POSSIBLE!
Many people & dispensaries sell edibles that don't have enough to get a fly high, & sell a lot of them with few complaints.
If 34 out of 34 people who ate the same brownie, all claimed to be high within 5-10 minutes of eating them, its no surprise to me, as I know better.

Nobody has ever eaten too much & died, so I doubt you're going to be first.
You'll just go to sleep. (for a very long time & then wake up stoned)

There's lots of people smoking, but few are getting high.
Nobody ever told me there would be days like these.