In other words, what the CDC is saying is:

Now, if those 100 resistant smokers were then followed for six months, we would expect that very few of them would quit smoking because all of them had already tried e-cigarettes and failed.

Lastly inhaling caffeine is not the best way to get caffeine into your bloodstream apparently. From this study , it seems caffeine is only 60% potent when inhaled versus ingested orally.

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