If you’re still smoking weed at 30, scientists don’t necessarily say you’re in serious danger—but they do warn that long-term use can have some effects you might not have considered. As cannabis has become more socially accepted and legalized in many places, many adults continue using it well into their 30s and beyond. That’s not automatically a problem, but studies suggest it’s worth being aware of what long-term, frequent use might do to the body and mind.

Research has found that heavy marijuana use over time can impact memory, focus, and decision-making. While the brain mostly finishes developing in the mid-20s, some areas related to attention and judgment can still be affected when cannabis is used regularly in later years. Some users also report feeling less motivated, emotionally drained, or increasingly anxious over time, especially if they rely on marijuana to cope with stress instead of addressing the root of their problems.

There’s also the issue of tolerance and dependency. While marijuana is less addictive than substances like alcohol or nicotine, scientists estimate that around one in ten regular users may develop a dependence. That means they start needing more to feel the same effects and can feel moody, restless, or irritable when they don’t have it. It may also affect sleep quality or make daily tasks feel harder without it.

This doesn’t mean everyone who smokes weed after 30 is doomed or irresponsible. Many adults use it occasionally without issue. But the real message behind the warning is simple: if cannabis is playing too big a role in your life, affecting your health, motivation, or relationships, it may be time to pause and reflect. Your 30s are a time when many people start thinking seriously about long-term well-being. Being aware of how your habits affect your future is not fear—it’s wisdom.