Yes, gynecomastia can be caused by marijuana use, particularly in young males. This is because marijuana contains delta-9-tetrahydrocannabinol (THC), which can interfere with the body’s hormonal balance by increasing oestrogen levels and decreasing testosterone levels. This hormonal imbalance can lead to the development of glandular breast tissue in males, resulting in gynecomastia. However, not all cases of gynecomastia are caused by marijuana use, and other factors such as medications, hormonal imbalances, or medical conditions may also contribute to the condition. If a person is experiencing gynecomastia and suspects that it may be related to marijuana use, they should consult with a qualified healthcare provider for an evaluation and treatment recommendations.