My advice for a carrier herb is mullein. It is very light and absorbent as well as extremely cheap (0.50$ for 1/4 OZ. OTC at my local herbarium.)and has no psychoactivity. It is used as tea to help open lungs for asthmatics and is pretty easy to smoke, especially for a seasoned smoker. Once it is infused, it's consistency is more like well cured marijuana and is easy to hit.
But to answer your question about bulk, mullien is far less dense than marijuana, so 1:1 ratio would maybe more sense to you once you see how much it is. It works out pretty well, hit size wise. I aim for one hit doses, instead of three.
I don't think cannabis is a good candidate for a few reasons. One, thc is alcohol soluble, so the process of making the e.l. wouldn't really be the best for it (dunno what it would do, solve the thc, and redeposit it?). Also you want a plant that is less liable to make you cough, and is comfortable to hold in, as that is crucial to a good experience. And finally, spice is the ONLY drug I've ever taken that does not agree with marijuana. That is my opinion of course, but it seems to be a pretty common one, you may want to try the combo for yourself to see if they synergize for you before you commit your stashes to it.
And tatt is telling no lies, enhanced leaf is extremely effective and fine tunable as an ROA. I dare say it's foolproof since it works for me.
Sine experientia nihil sufficienter sciri potest -Roger Bacon
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