TUESDAY, April 17 (HealthDay News) -- While smoking marijuana is never good for the lungs, the active ingredient in pot may help fight lung cancer, new research shows.

Harvard University researchers have found that, in both laboratory and mouse studies, delta-tetrahydrocannabinol (THC) cuts tumor growth in half in common lung cancer while impeding the cancer's ability to spread.

The compound "seems to have a suppressive effect on certain lines of cancer cells," explained Dr. Len Horovitz, a pulmonary specialist at Lenox Hill Hospital in New York City.

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