Does marijuana use lead to the use of other drugs?
The “gateway drug” concept—where using one drug leads a person to use other drugs— generates a lot of controversy. Researchers haven’t found a definite answer yet, but as of today the research does suggest that, while most people who smoke marijuana do not go on to use other drugs, most teens who do use other illegal drugs try marijuana first.
For example, the risk of using cocaine is much greater for those who have tried marijuana than for those who have never tried it. However, this risk is also greater for people who have used alcohol and tobacco.
Animal studies suggest that because the teen brain is still developing, using marijuana, alcohol, or tobacco in your teen years (or earlier) may alter your brain’s reward system (see the answer to #3 above), and that may put teens at higher risk of using other drugs. In addition, using marijuana puts children and teens in contact with people who use and sell other drugs, increasing the risk of additional drug use.