I think you need much time. The problem for me was to find the right tobaccoad. I have made over 40 extractions without success and have wasted much time. Now its better, because i know what kinds of tobaccos are good for my taste. On the other side the time for the different extraction methods plays a role. For ethanol you need much time but for cold or hot pg its okay.
I had the same experience. You might recall I mentioned the time factor, failure rate of random tobaccos and to go in slow and do a few extractions a few weeks ago.
I did the same thing you did. I charged in with high optimism looking forward to having a bunch of great liquids from the cigars and cigarillos I was smoking during a holiday in Thailand 2 years ago (my bad). I made about 30 extractions. So far the only one that is okay to good is, ironically, an extracted Mevius cigarette in WTA liquid. This happened to be the extraction I least expected to turn out good given that I was extracting a non organic cigarette full of toxins and chemicals.
I still have many of the extracts so I am going to mix them again in sampler sizes and try to get the mix right (use 20% extract instead of 30% and less nicotine).
Alcohol based extractions take time more because you need to pay more attention when evaporating the alcohol. You can't filter your new extraction in a coffee filter or micron paper straight from the jar and wait for it to filter through. There is an important middle step. Get it wrong and you ruin the juice. If there is still too much alcohol you can evaporate further.
What I learnt was to start with smaller batches and use tobaccos that are tried and tested by the experienced DIY NET community. If you can't find a tobacco that is tried and tested then follow some basic tenets such as making sure the tobacco is fresh and tobacco that is aromatic in some way. Pipe tobaccos have a generally higher percentage chance of success.
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