Did you know that adrenaline is a hormone that is responsible for immune balance, regulating blood pressure, response to stress, and other functions? If you are talking of boosting your happiness or having fun, then you are talking of dopamine, not adrenaline, so the hormone that is released to feel good and reduce stress is known as dopamine, which can trigger peace of mind, sleep,and a sense of pleasure.
You are right. I forgot to mention dopamine as I was using 'adrenaline rush' casually. Both adrenaline and dopamine are involved in the gambling experience, but each functions differently. However, adrenaline also functions in stress and can be linked with gambling in terms of emotional aspects, specifically excitation. Like every activity, gambling also has its high called the 'thrill'. This means both hormones 'work' during gambling practice. Adrenaline allows the body to have the physical aspect (excitement), and dopamine provides the mental aspect of looking forward to betting (and feeling pleasure).