Definatly. A grinder gives a perfect chop to the weed so you've got as much surface area and as much vapable THC out in the open for the vape to do it's best.

I forgot to mention, i've been smoking larger amounts than 1/4 oz a day for the last 4 years, it's only doubled around christmas just gone. I've been smoking weed for more than half my life, but up untill 2005/2006 it was recreationaly, not medicinally like it is now, but i still enjoy it so it's both.