it doesnt really matter, the "essential oils" are trapped in a waxy trichome while growing which you rupture while trimming.
of course through heat, natural vapor pressure and properties of the compounds themselves they can migrate through.
keep in mind many of these compounds will burn skin and some are toxic. they are the same compounds in other plant's essential oil that you can purchase for whatever home use aromatherapy , insecticide etc
they also can destroy plant tissue through apoptosis
you very well may have an allergy to them
theres a wide range of alcohols esters aldehydes etc being released
alright ive filled my quota of intelligent posts... back to fucking around in toke n talk