You read that right: There was indeed a smoking cabin on the Hindenburg, the largest flying object ever built and filled with 6 million cubic meters of highly flammable hydrogen. And in fact it caught fire in an accident on May 6, 1937 which destroyed it in just 30 seconds causing the death of 35 passengers.
It was a highly pressurized closet (to avoid hydrogen infiltrations) and separated from the other rooms thanks to a double door.
It was constantly monitored by a staff member and matches, lighters or other small flames were highly prohibited (which however were incredibly allowed in other areas of the airship).
In reality, the issue of pressurization that I have just illustrated to you was more a matter for the press offices than a real effective safety measure: the smoking room was located on deck B at the bottom of the aircraft and in a position in which infiltrations would in any case pose all sorts of risks for fires and blazes that would have set the whole of Hindenburg on fire instantly.
Why take the risk? Well, considering the time, the smoking room was by far the busiest on the airship. Everyone smoked. And then in the smoking room there was also the Bar: indispensable :)
