For full effect, yes. But it's definitely not zero effect if you don't decarb.
Some people just can’t get high from edible cannabis
There could be a number of reasons as to why edible cannabis doesn’t get some people high. However, the main reason why scientists think this happens is due to differences in how the liver metabolizes THC (9).Why Don't Edibles Get Me High? - Do It Yourself Edibles Kits
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