San Francisco is the only place I've ever seen custom glass funnels for sale at headshops.
SF is also the only place I've ever seen flyers advertising a Whipit delivery service (nitrous oxide).
Generally speaking SF seems to be much more loose with drug use than other cities in CA - although I will say, from what I've seen, the use of pharmaceuticals like benzos and adderal seem to be treated as lightly as alcohol these days.
disaffected, loserish kids in the suburbs are doing it just as much as rich bay area yuppies.