That's just naive.
Tobacco had hundreds of years of use as a medicinal before we realized anything about addictions and cancer.[1] It also looks to be a very viable biofuel (at least a GM'd, non-smokable version of it) providing 3x per acre the amount of ethanol per acre as corn and 3x per acre the amount of oil as soy. It's also a natural pesticide & insect repellant and source of saltpeter/potassium nitrate.
Not just that, but smokers mostly just hurt themselves and smoke for the benefits nicotine provides them. People drink alcohol too and that's not good for you either.
We will be growing and selling tobacco long after people stop smoking it.
I'm not aware of any medicinal benefits of nuclear weapons or nerve gas. Almost nobody has any reason to produce either.
This is veering off into stupid territory.
[1]:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1079499/