Trace toluene in distillate?

Hash and Stuff Distillation
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I had some crude thc made from cbd, ptsa and toluene

after distillation, there is a subtle smell of burnt cake

do you think it can be trace toluene? As sometimes terpenes still make it in the final distillate so why not toluene.

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You can use heptane instead of toluene and this reaction will work fine.

burnt cake is a new one for me. Unless you’ve got a super pure reaction and distillation, there’s a lot of unknowns you could try to blame the smell on.

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But could it be a faint smell from trace toluene?