Paul K. Dickman writes:

SAFETY SHEET

When I was in high school, at the state fair there was a bright fellow who
had made a miniature wind tunnel using a vacuum cleaner and a box with a
glass side. Little slipstream tubes were fed by this apparatus sucking
on--get this--a LIGHTED CIGAR! Made cute little streams of smoke in the
tunnel so you could see the aerodynamics in action.

They won't let you ignite anything today. Not to mention the evil tobacco
carcinogen.