From google search quick...
"Genetic engineering is a process that alters the genetic structure of an organism by either removing or introducing DNA. Unlike traditional animal and plant breeding , which involves doing multiple crosses and then selecting for the organism with the desired phenotype , genetic engineering takes the gene directly from one organism and delivers it to the other. "
and
"A genetically modified organism (GMO) is any organism whose genetic material has been altered using genetic engineering techniques. The exact definition of a genetically modified organism and what constitutes genetic engineering varies, with the most common being an organism altered in a way that does not occur naturally by mating and/or natural recombination"
Looking up 'gmo and tumor' is enough to turn me off from it for cannabis and their food, though, I was never really interested. And we all know they are being push on us from the worst of the worst 'corporations' (whatever that's supposed to be), you couldn't even imagine. From what I have seen, gmo plants can't even achieve good enough health to allow them to fend off pest on their own, so, they get doused on round up or similar, for sure not interested in that, for my weed or food.
So far, nothing I have ever grown organically outside has gotten a spider mite infestation, every time I grow with salts/non-organic bottle nutes, spider mites, even if the salt plant/s appear more healthy and/or the organic plant seems to be in very poor health and all my plants are close enough it's no problem for mites to transfer from one to another. See 'brix for plants' in general and 'gmo plants brix' (if you can find anything on it).
For cannabis I would prefer the wildest possible seeds, not messed with by anyone (including/especially 'breeders'), and the same goes for food. Using gmo seeds seems like the worst form of messing with a plant you could do before it even sprouts, unless messing up the 'environment' it would live in was an option.
I could never imagine anyone doing plants better than nature, they have all been here, thriving, for who knows how long, the only thing that stops them from doing so is people getting in their way/messing with them.
Tl;dr, I have never seen anyone that makes me think, "I'd take a seed from this person over a seed from nature because they probably have better seeds".