Discover - Chris Christie recently said that marijuana is a “gateway drug” while arguing for enforcement of its federal status as an illegal substance. Though there are correlations between marijuana use and other drugs, there is no conclusive evidence that one actually causes the other. The science on this topic is far from settled.
OUP Blog - Does marijuana produce an amotivational syndrome? Whether the amotivational syndrome exists or not is still controversial; there are still too few poorly controlled small studies that don’t allow a definitive answer. Most people who use marijuana don’t develop this syndrome.