They’re better than cigarettes, so they’re the lesser evil.

You cannot say "better" in this context without an almost endless degree of quantification that could fill textbooks. By what metric? Public health? Cost effectiveness? Environmental impact? How do we measure these things? I assume you're arguing a health perspective (which, at this point all we can say is probably better), but in the context of TFA "better" is more likely to be interpreted in an environmental context, of which I haven't really been convinced either way.

I would argue that in the context of ops complaint they are worse.