Really the only homemade concentrates or extract is vanilla from whole beans, coffee and NETs, naturally extracted tobacco from either tobac leaves or good cigars. I wouldn't venture into making your own concentrates just from the unknowns that can be in the finished product like oils that shouldn't be vaped. I did make a NET from some broken cigars I bought and it turned out OK for my first time but for the money spent on cigars, PG and time IMO its not worth it for the amount you get, granted the right leaf tobacco NET will taste better but thats a opinion since everybody has different tastes and likes.