Levels of THC are found in breast milk of mothers that use marijuana.

The new study is raising concerns about the safety of an unborn child after a report was released by the University of California San Diego.

UCSC School of Medicine Researchers set out a quantify the lingering levels of THC detectable in breast milk for up to 6 days after the mother had used the drug.

THC is the primary psychoactive component of marijuana.

The study that was conducted by the university did not probe into the health or neurological impacts THC could have on a nursing infant.

50 women that smoke marijuana were selected to provide 54 samples daily, weekly, or sporidcally of their breast milk.

Researchers found out that 63 percent of the breast milk samples that they had collected from the women who had used marijuana in the past 6 days had THC levels lingering in them.