Fair call Kalyx i made all forms of extracts, and i wouldn't smoke it unless i made sure myself that i have evaporated all remaining solvents, the solvent i use boils at an incredibly low temperature - 40 degrees Celsius so it doesn't take much to fully evaporate at all. Shellite leaves 0% residue after spill/evaporate test even a high volume like 500ml i have tested for this purpose alone. Also shellite is only volatile at 230 degrees Celsius if heated, and is only flammable very close range as the gas disperses very quickly, if you do the evaporation with a fan only outside in a closed off area from wind you would be fine, providing you use other flammable precautions in the first place.....no flames obviously.
I agree i like the natural extracts also, but for potency you can't really beat honey oil....in my opinion anyway. You never need a 2nd hit. Well you shouldn't if made from quality product.
downing .5 gram in a pill? daaaamn, thats alot of cannabanoids. I personally only use it for my insomnia, but it does work for pain relief, i totally believe it does.
out of 100mg of hash oil ( 0.10g ) i would get 5-10 hits on top of a bowl, depending on size, it goes a looooong way!

so if that has any 'residue' at all, if any, is it worse than what we breath in the air everyday? i'm doubting that. But, stick with what YOU feel safe with by all means, if you are getting high, go for it

enjoy any form of cannabis the way you like because there are soo many ways for everyone out there for everyone