Marijuana is one way of getting "high" and out of all "substances" that can get one "high" I feel it's the best, i.e., can give one the most benefit at the least cost.
There are also many other ways of getting "high" that do not involve substances. A good conversation can get you "high", lovemaking can (obviously) get you "high", getting together and working on a project with like-minded people can get you "high"... a joke can get you "high"... laughter itself can both be a manifestation of being "high", and can get you "high" itself... I remember one time when I was a young teenager, before I had ever used herb or any substance stronger than coffee, I was playing basketball with my brother and we both suddenly, spontaneously, for no apparent reason dissolved in fits of delirious laughter that lasted for ages... looking up at the stars can get you "high", just being in nature can get you "high". But to I the "highest" experience is when creativity flows. I write fiction and I chat lyrics, and when things are really "flowing", such that you aren't even really consciously trying to create any more, you just are creating spontaneously... hard to put into words... anyway, that's the "highest" experience to I. Unless it's "falling in love"... but that's more like a combination of highs and lows... and often involves an element of self-delusion (for I anyway)...
Well those are my two cents for the time being...