The prominent effect of Mars OG is that it makes you incredibly lazy. You don't feel like doing anything once you smoke it. In addition to that, it makes you euphoric, sleepy, uplifted and happy. This strain is excellent for treating insomnia. You soon fall asleep after smoking it and sleep for quite a long time after using it. It is also useful for treating stress and anxiety of different types. It is helpful in alleviating symptoms of depression.