What is the limit for prohibiting the consumption of harmful agents if excessive consumption of lawful things could cause harm?

Smoking is forbidden because it is among the evil things and is harmful to health. Allah has forbidden evil things and permitted good things. This is evidenced by the verses: "And makes lawful for them the good things and prohibits for them the evil things" and "And do not throw [yourselves] with your [own] hands into destruction" and "And do not kill yourselves." This differs from permissible foods and drinks, which may cause harm when consumed in excess, as the harm in those cases is not in their essence but in their misuse.