SAN DIEGO -- San Diego teenagers who smoke are going to have a tougher time getting tobacco, thanks to a Web site that reports stores that sell to minors.

The Web site -- Tobaccowatchdog.org -- allows Internet users to report retailers who sell tobacco to minors. The Web site generates a report that is sent to the County's tobacco control resource program. A follow-up investigation can lead to heavy fines and, in some cases, the revocation of a store's tobacco license.

Tobaccowatchdog.org has the backing of the American Lung Association and the Tobacco Free Coalition. The groups say the Web site has already been effective.

"In the city of San Diego, we were able, in the 4th district, we found that 71 percent of the merchants were selling products illegally to 15-year-olds," said Juan Smith, of the Tobacco Free Coalition.

The crackdown comes after a survey revealed that a number of San Diego stores were selling tobacco products to minors. In the three-month undercover survey, nearly 90 percent of San Diego stores did not ask for ID. La Mesa topped the list of leading offenders, followed by San Diego and El Cajon.

Tobaccowatchdog is funded by Prop 99, which uses tobacco tax money to fund anti-tobacco programs.