Final answer:
Heavy marijuana usage can damage the brain and respiratory system, lessen motivation, and cause cognitive impairments. It includes a wide range of adverse effects, affecting both physical health and psychological functioning.
Step-by-step explanation:
Heavy usage of marijuana can cause several adverse health effects. Firstly, it can damage the brain, making it difficult for people who started using marijuana in their teenage years to think, remember, and learn effectively. In addition, smoking marijuana frequently can lead to coughing and breathing problems and could affect child development during and after pregnancy if a woman uses it while pregnant.
When it comes to psychological effects, heavy use can impede memory, learning, perception, and judgment. It may also lessen motivation and interfere with commitments such as schoolwork and other activities. Considering both the long-term health concerns and psychoactive effects, the answer is that heavy usage of marijuana can cause all of these issues - damage to the brain, heart, lungs, and immune system; impeded memory and learning; diminished motivation; and interference with daily activities.