Smoking marijuana can lead to an increased risk of which of the following?

Marijuana use is often associated with an increased likelihood of experimentation with other illicit drugs, a phenomenon known as "polydrug use." This risk arises for several reasons. First, individuals who smoke marijuana may become accustomed to the effects of psychoactive substances and seek out stronger or different experiences, leading them to try other drugs. Second, marijuana use can alter an individual’s judgment and decision-making, potentially lowering inhibitions about trying other substances. Additionally, social circles that have marijuana use as a common behavior may also engage in or introduce individuals to other drugs, creating an environment that normalizes the use of various illicit substances.

In contrast, the other options present behaviors or outcomes that are generally positively correlated with healthy living and do not reflect the increased risk associated with marijuana use. Focusing on academics, establishing healthy relationships, and engaging in sports are activities that benefit from clear cognitive function, motivation, and health, all of which can be negatively impacted by substance use, including marijuana. Therefore, they do not align with the risks associated with marijuana consumption.