Is marijuana a gateway drug—it is a question that has been asked by many, and a topic that is often debated. For those who are not aware, a gateway drug is a substance which apparently leads the user to bigger addictions. Gateway drugs are usually stimulants or mood-altering substances that do not bring about any physical dependence in the user, but evidently lead to much stronger and dangerous drugs. It is widely believed that marijuana is one such drug. Its use can lead the user to the use of harder substances, for instance, heroin, cocaine or crystal meth. So what gives rise to this debate over whether marijuana is a gateway drug or not? Let’s take a look at both sides of the coin.