Undercover, I agree with you, that the article was written to make the jw's feel guilty about one more thing. My goodness, how much coffee can one drink in moderation? Why even write the dang article, unless they wanted to plant some guilt.
Your right there is no scripture that say's one can not smoke, but they will find something somewhere in the bible and make it fit. The one used on me for smoking had something to do with not defiling the body.