Genetic-engineered tobacco produces cocaine in its leaves.

Genetic transformation and genetic engineering allow researchers to create many things that were impossible before. The genetically engineered vegetables that are creating chemicals are always interesting. 

The ability to create tobacco that forms cocaine also causes thoughts that members of organized crime gangs can steal a couple of seedlings of those vegetables. In the wrong hands, genetic engineering makes it possible to create regular-looking plants like field mustard that make it possible to create narcotics like cocaine and opium. 

Genetically engineered vegetables can form medicines. They can form antibiotics and some other things. But the possibilities that genetic engineering gives have no limits. 

Genomes that are making spiders create their fiber can transfer to hemp and cotton. That allows us to create that ultra-hard material in large numbers. 

Genetically engineered vegetables can use to create fast-growing trees. The genome of beans can connect with the genomes of iron trees. And that thing makes it possible to create fast-growing very hard trees in forests. There is also the possibility of creating things, like spider web material by using cotton or hemp. 

In that case, the genomes that produce fibers in cotton or hemp will replace by using the genomes that are making spiders create their web. Spider's web is one of the hardest materials in nature. And if that material can form a large mass, it can revolutionize technology. 

The problem with genetically engineered plants is that they are superior to natural species. There is the possibility to create corn or grain. That is poisonous while it grows. And then that creature turns non-poisonous when it's time to harvest. 

But genetically engineered plants where connected genomes of animals can make much more. There is a possibility to turn some horror-movie into reality by transforming genomes into vegetables. That are producing tetrodotoxin-type zombie poisons. Those poisons can use in riot-control situations. Tetrodotoxin is normally poison that fish creates. And the thing that causes death is drowning. But in dry land tetrodotoxin makes the person unable to resist commands. 

When we are thinking about the possibilities. Genetically engineered vegetables have, we can say that they can form almost everything. In the wildest visions, genetically engineered vegetables can form organs for transplants, or even animals and humans.

https://www.livescience.com/40690-zombie-haiti-are-zombies-real.html

https://www.sciencealert.com/a-tobacco-plant-has-been-engineered-to-produce-cocaine-in-its-leaves

https://en.wikipedia.org/wiki/Tetrodotoxin