potency levels have actually gone up a fair amount for one main reason: growing methods. in the 60s many juss popped a seed in the ground n let it do itz thing. but now ya got better chems,soil,lighting etc...
for example take the average outdoor crop and compare it to sum hydro thats been chem'd to shit an all the rest...potency will most likely b higher in the dro. as fer the health part, fucked if i know fucked if i care hahah
PeAcE N HaPpY SmOkIn