How come tobacco have arsenic?

[Vivaldi]

Is it added in factory or is it naturally occured?

[NathanDavis]

tobacco has every chemical in this world in it... lol

[Vivaldi]

Why? It is one plant

[NathanDavis]

plants do absorb chemicals from the earth

[NathanDavis]

but yeah... I meant cigarettes, they do have every chemicals and their grandma from earth

[Vivaldi]

Some are added in factory?

[Vivaldi]

Or all naturally?

[buzzword]

Plant roots absorb arsenate through phosphate transporters.

[buzzword]

It's a structural analog. The same reason it is toxic for humans and interferes with metabolism in our bodies is the same reason it can be absorbed by plants. Plants need the macro-nutrients nitrogen, phosphorus, and potassium first and foremost before other micro-nutrients so as a result arsenate and arsenite end up being absorbed if they are in the native soils where plants are being grown as they try to accumulate phosphorus.