People smoke and drink. Thals are people and some drink and/or smoke. Is it anymore self-destructive in thals than non-thals? Is it intentionally self-destructive, or any more so in thals? It is very foolish for thals to smoke because in addition to the known risks of smoking, cigarette smoke contains high amounts of iron which is readily absorbed by the lungs. Drinking to excess is also foolish, as the livers in thals are already under great stress from iron.
But isn't the most self-destructive thing that many thals do is not complying with chelation?