Is it wrong to grow tobacco?
Is it wrong to be a gunsmith?
Both occupations manufacture a product that when used are potentially deadly.
Interesting thought… The farmer isn’t rolling the cigarette or lighting it… just providing the contents. The gunsmith is crafting the weapon, but not loading or firing it…
Guns can have a positive use though. Maybe I am ignorant, but I am not aware of a positive use for cigarettes, unless you want to count stress relief.