Herms can be smokable. Males are a no no.
If you have a herm in your garden , remove herm or you risk pollinating what females you do have.
Most imported weed(columbian/mexican, etc etc is herm(buds with seeds)
Stress, genetics, play a big part in the herm population.
Some growers will intentionally cause stress to a female they like so they can collect the seed from that particular strain. If a female is stressed and provides you seeds then more than likely your seeds will be femanized.
If you get seeds through a genetically produced herm, and not a stressed female, then your seed has more to do with genetics then stress and will give you a less predictable seed.

dai*ma