4. We will assess the effect of daily monitoring on salivary cotinine levels. Smoking reduction is not a specific goal of this program. However, participants who access the 4D's coaching screen on the Palm when they have an urge may reduce their smoking. We hypothesize that reduction in cotinine levels will be correlated with greater frequency of accessing the 4 D's screen. That is, participants who access the 4D's screen most often (more than 5 times per day) are expected to show more reduction in cotinine levels compared to baseline than are participants who do not access the 4 D's screen