Using marijuana after 30 isn’t automatically dangerous, but research suggests that frequent or long-term cannabis use can come with health risks worth understanding. One Australian study involving more than 10,000 people examined cannabis and amphetamine use at ages 21 and 30 and found that continued substance use was associated with lower levels of employment, income, and other measures of adult success. However, the study was observational, relied on older Australian data, and could not clearly separate cannabis from other drug use—so it does not prove that marijuana itself caused those outcomes. 🧠

Cannabis can also affect several parts of the body. Smoking marijuana can irritate the lungs, causing coughing, wheezing, and increased mucus, while THC can temporarily raise heart rate and affect blood pressure. Research has also raised concerns about cardiovascular health, particularly with frequent use. On the mental side, cannabis can affect memory, attention, judgment, and coordination, with stronger concerns associated with heavy use and use beginning during adolescence. The risk of developing cannabis use disorder also increases with more frequent consumption.

At the same time, the picture isn’t simply “marijuana is bad.” Certain cannabis-derived medicines have legitimate medical uses. CBD-based medication is approved for specific severe seizure disorders, while some cannabinoid medicines can help with problems such as chemotherapy-related nausea and certain types of pain. Effects vary considerably depending on the cannabinoid, dose, product, and individual. That’s why medical cannabis should not automatically be treated the same as recreational marijuana use. 💊

The biggest takeaway is that age 30 itself isn’t a biological cutoff where cannabis suddenly becomes harmful. Instead, potential risks depend on factors such as frequency of use, THC potency, method of consumption, age when use began, and a person’s overall health. Avoiding cannabis before driving or other activities requiring full concentration is especially important. For people who use cannabis regularly or rely on it for medical reasons, discussing its benefits and risks with a healthcare professional can provide a clearer picture than viral headlines ever could. 🌿