Courtland Milloy's ''Don't Get Mad, Get Busy'' {Sept. 30} brought home a lot of things about some of our black leaders. Just how mad they are we will never know. What we really know is that they are not mad enough to:

1. Stop the tobacco companies from exhibiting and passing out free samples of cigarettes at meetings held by black associations and organizations;

2. Stop having liquor and beer companies sponsor their dinner and banquet functions; and

3. Stop beer companies from passing out free beer to anyone in the exhibit hall.

A most disturbing thing happened last Saturday in the Congressional Black Caucus legislative weekend exhibit hall. The exhibitors at the Philip Morris exhibit were so busy socializing that they failed to see that children were getting free samples of cigarettes. When this matter was brought to the attention of one of the exhibitors, he explained: ''She was with her mother.''

Another disturbing thing was that our schoolchildren were exposed to this beer-drinking atmosphere, and there were long lines of adults waiting for free cigarettes. School buses were lined up outside the Washington Hilton Hotel waiting for the exhibit hall to open its doors.

Please don't get the impression that our black leaders are the only ones guilty of accepting money from tobacco companies. On Sept. 18, the Women's Research and Education Institute had an awards dinner honoring Johnetta B. Cole, president of Spelman College. Among the ''patrons'' for this dinner were Philip Morris Cos., Inc., and RJR Nabisco, Inc. One of the ''friends'' was the Tobacco Institute.

On the board of directors of the Women's Research and Education Institute is the former secretary of Health and Human Services Margaret Heckler. Has Mrs. Heckler forgotten that she was the author of a report on smoking and cancer?

As Mr. Milloy stated, ''Don't Get Mad, Get Busy.'' The life you save by refusing monies from the tobacco companies may be your own. Take charge of your life, don't rely on our leaders.

LLOYD E. CLAYTON Washington The writer is national coordinator of Operation Taking Charge, a volunteer group that disseminates information on health education.