The curvature of the glass will most likely bend the beam too much to do any real smoking.. unless you like light hits and not a cloud of vapor and smoke like a real vape.
the glass I don't think will heat up too much either, so this is going to have work on the beam hitting the actual buds. An unfocused diode will do a more efficient job of burning things.
I would get my self a flexmodp3 an a140 diode in a module, or any diode that can withstand high output around 1 watt or more, heat sink the hell out of it
and find a way to connect that heat sink to the end of your glass tube with an air tight seal, rubber will work but I like glass on glass
then have your tube run on the other end.
this would create a passive vaporizer (you would have suck to draw smoke out) versus a typical vaporizer has some sort of air pump mechanism to do the work for you (much more convenient)
I too live in the great state of CA
Edit: this is by no means a discouragement to what you are doing, an experiment is an experiment.
You may just prove me wrong and make something very useful for yourself and add to peoples knowledge of lasers!