THC drops and hash

Can you eat hash and get high or should it be cooked with some food? (i know you can smoke it)
hash vs smoking weed whats the differences?
THC drops, how long does it last? hard to make? gets you high? any bad side effects on health?
thanks -s|ean

just read two articles, maybe I should just make some Green Dragon.
THC drops... warning - totse.com community
https://www.rollitup.org/general-marijuana-growing/17359-how-make-thc-drops.html
https://www.rollitup.org/general-marijuana-growing/17359-how-make-thc-drops-6.html