Healthy persons with normal kidney function have no risk of aluminum toxicity from aluminum cookware.
"Dietary aluminum is ubiquitous but in such small quantities that it is not a significant source of concern in persons with normal elimination capacity. Urban water supplies may contain a greater concentration because water is usually treated with aluminum before becoming part of the supply...
In healthy subjects, only 0.3% of orally administered aluminum is absorbed via the GI tract and the kidneys effectively eliminate aluminum from the human body. It is only when the GI barrier is bypassed, such as intravenous infusion or in the presence of advanced renal dysfunction, that aluminum has the potential to accumulate...
Aluminum toxicity is usually found in patients with impaired renal function."