Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Once again, shares of Star Scientific (Nasdaq: CIGX) fell more than 10% on no news whatsoever. Welcome back to the wide world of speculative microcaps.

So what: A broad market meltdown appears to be to blame for Star's suffering this time. For long-term investors, it's an opportunity to get in at … 28 times book value and 566 tomes sales. Ouch.

Now what: Bullish investors will rightly counter that Star's CigRX dietary supplements are no different from any in-development drug and that the potential payoff for reducing or eliminating cigarette cravings could be in the billions. In that sense, today's selloff could be a non-event. Do you agree? Disagree? Weigh in using the comments box below.

Interested in more info on Star Scientific? Add it to your watchlist .

Fool contributor Tim Beyers is a member of the Motley Fool Rule Breakers stock-picking team. He didn't own shares in any of the companies mentioned in this article at the time of publication. Check out Tim'sportfolio holdings and Foolish writings, or connect with him on Google+ or Twitter, where he goes by @milehighfool. You can also get his insights delivered directly to your RSS reader.

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