-Or-
you can add a couple of uncoated aspirin to a quart of water. A couple or few applications during normal watering schedule, and you'll get the nanners.

-Or-
you can take one female out of her flowering closet a few nights in a row. Put her under a couple of CFL's for 15 minutes a night, returning her to her flower closet in the morning. Nanners will form. I use this technique most often. No worries about smoking additional residue.

I'm not a big fan of those extremely invasive methods of stressing the ladies, and it renders the plant potentially toxic for smoking. I've never seen a study that has tested the effects of smoking steroids, hormones or gibberellins, or their respective vapors, but would not take the use of these chemicals/hormones/steroids on our smokables, lightly.
Since rarely does someone cull the pollen donor, (the one that has been poisoned) it's usually just smoked or sold. (dispensaries)

Gibberellins and heavy metals just shouldn't be smoked and really have no place in a medical-users stash box. Especially if drug interractions are a concern, as some of us are on a variety of medications and treatments.

Doubtful it's doing cannabis genetics any favors, either.
(Don't fem a femmed lady. Mutants are possible, if not likely.)