A fee supply of nicotine replacement medication and a handful of automated phone calls made smokers who wanted to quit much more likely to succeed, according to results of a clinical trial published Tuesday in the Journal of the American Medical Assn. The researchers who designed the trial said they were looking for a simple and inexpensive way to aid smokers who were already motivated to kick the habit. They estimated that once their 90-day program was set up, it could be maintained at a cost of less than $1,000 per quitter.