Would not recommend allowing student to do pot or bong.
There are MANY more issues in today's society that can be
tackled. Remind students that school is funded by
taxpayers' money and they are not supportive of art that is
sex or drug related. Remind students that in the privacy of
their own home and with their own money they can express
themselves in ways they see fit, but in a public funded art
room there are some restrictions. I often have a
conversation with my students on the trials and tribulations
of accepting money for your art, and the issue of government
as a patron of the arts.