The machine does have a scent-lock technology so the majority of the smell will be contained within the machine. It does not mask it 100% but the lingering smell will dissipate very shortly. Decarboxylation does provide a smell but with our Decarbox and airtight lid, we are confident this will be somewhat masked as well. When transferring the herb from the Decarbox to the Machine there will be a small scent that emits but within the containers, it will be severely masked.