In life, the sins of the father often pass to the son. Now, new evidence shows an intergenerational effect on the motivation of rats whose genetic forbears had been exposed to marijuana. In experiments, investigators gave half the study population injections of marijuana’s active ingredient, delta-9-tetrahydrocannabinol. The other half received a saline solution. A generation or two later, the descendents of the first group showed a lowered desire to seek the reward of “highly tasty food,” in laboratory experiments conducted by Yasmin Hurd, of Mount Sinai School of Medicine.
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