Take the following as truth: Tens of millions of humans, as we know, willingly partake of marijuana, and these differences between rat and human behavior should discourage us from using two rat studies to assert that a) marijuana is addictive in the same way as harder drugs are and b) marijuana primes humans for addiction to harder drugs.
Then the following statement: "No rat studies have been carried out to investigate marijuana." is true, false, or inconclusive?
Answer: False