The strength of the cigarette manufacturers' lobby in Washington is waning rapidly because the industry has alienated longtime supporters, a tobacco-state congressman said yesterday.

"I'm not the lockstep loyalist to the tobacco companies that I was five years ago," said Rep. Charles Rose (D-N.C.) "In my opinion, the tobacco companies are rapidly losing their grip on Capitol Hill."

Rose was interviewed on the CBS News program, "Face the Nation,"

Surgeon General C. Everett Koop said on the program that cigarette smoking is addictive and cigarette ads should be outlawed.

Koop said he deplores the increase in smoking among young women, and he put part of the blame on women's magazines that carry large numbers of cigarette ads.

"Dr. William Pollin, director of the National Institute of Drug Abuse, has said that nicotine is the most addictive drug in our society," Koop said. "And in the 1983 report that I made on smoking and health, I talked about both the addiction that is physiological as well as psychological."

Of increased smoking among women, Koop said: "I think a lot of that falls at the feet of those who should be most interested in women. For example, the magazines that cater to women do not warn them in any way editorially about the dangers of smoking . . . although they cover every other health issue from falling hair to falling arches."

Rose said tobacco companies lost support by increasing their tobacco imports, rather than buying from the farmers he and other one-time industry backers represent.