And tobacco isn't organic?
Not with what the cigarette companies do to them.
I'm sure you can buy organic tobacco.
And what's to stop pot heads from growing their own weed? Isn't marijuana easier to grow than tobacco?
It's "easy", but not everybody has the room(what if you're living in a studio apartment?), or even the minimal greenthumb required.
On diesel grows - indoor grows using diesel generators, I think I should point out that such is done to grow illegal weed. If growing weed is legal, then they don't need to hide, and can use economical and ecological methods - hooking up to and using the grid without fear, actual greenhouses that admit sunlight, even outdoor operations. Though outdoors has the problem that the best bud is unfertilized, and growing outdoors is a good way to have your buds get fertilized by pollen in the wind.
So the best way to stop diesel grows is to legalize.