I have previously used GA for foliar feeding the plant with hormones, thus inducing the hermaphrodism, and it makes the plant really stretch. I have smoked the plant afterwards, with no apparent after effects or aftertaste that I could detect. (plant was well-flushed, tho)
I truly do not believe there would be enough GA in the plant to affect normal smokers, especially at the dilutions recommended, and do still use it to 'pop' stubborn seds.
BUT
If I had hep-c (as I do) or if my wife had t-cell lymphoma (as my wife does) I would be caereful to note that this has not been proven to be safe, and would recommend reading this msds sheet, especially Section 5 - Fire fighting measures, as inhilation of the burned hormone is what is at issue here. https://fscimage.fishersci.com/msds/10405.htm.

I have previously scoured the internet looking for the horror stories of blindness, peoples hair falling out, or dicks falling off from smoking the stuff, and I found none.
I am not a botanist, nor a chemist, but personally...I think there is no way that GA is as bad as...sitting on the freeway during rush hour, smoking speed, or using those electric "scented candles".

Does here anyone have links to proof substantiating either side of the issue? Would sure be helpful, lol.