[swombat]

There are plenty of toxic chemicals in car manufacturing. Hell, cars (particularly old ones) produce these toxic chemicals continuously while you drive them! Smart phones are a hell of a lot less toxic than cars.

As for the comparative benefits, we could argue until the cows come home - both products are insanely useful and life-changing - but if we simply declared them equally useful, that would make phones a better bargain due to the much smaller amounts of toxicity.