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First, the bias covariates used, although carefully extracted and evaluated, were based on observable study characteristics and thus may not fully capture unobserved characteristics such as study quality or context, which might be major sources of bias

That doesn't mean chewing tobacco isn't disgusting and, possibly, deadly

This study isn't the first to note that plants can absorb and hold certain toxic materials, but it does drive in that this process can happen in more ways than expected

Paroxysmal atrial fibrillation following electronic cigarette use in an elderly woman

Centers for Disease Control and Prevention, TOBACCO PRODUCT USE AMONG ADULTSUnited States