Perhaps, yes, but not inevitably. We're not talking about hypotheticals, we're talking about a specific, known data point -- that the Iotians did not smoke -- and attempting to explain it. As you say, given that they were so imitative in every respect, it stands to reason that they would've included smoking along with everything else they imitated, if they'd had the means. So the absence of smoking suggests that they didn't have the means, that they were unable to find an adequate substitute for tobacco in the hundred-odd years since the Horizon's visit.