It is just an older, over ripe and swollen primordial calyx (the ones that grow on the stems).
The plant will be fine to smoke, even if it does have seeds, seeds are not toxic, they just explode when you least expect it!
You can look inside the calyx and if there is a seed, then obviously there was at least one male flower somewhere.
Your young plants will be ok, maleness or hermaphroditism can not be transferred from plant to plant, but if there was a male flower somewhere, spritzing your entire grow space lightly with plain water should destroy practically all of any of the left over free floating pollen, if the heat and light exposure hasn't killed it already.
Hope this helps, Organoman.