Smoking tabacco is my answer.
Answer:
You like him, from ur explanation I can see that he might also like u. The part of the being the flirty type, I don't know what to say about that. All I have to say is that, if u like him y not tell him how u feel and see how he responds and reacts to what u told him. It is a 50/50 chance go for it but remember don't allow ur feelings bring down ur academic performance
You can increase your awareness of hereditary diseases by discovering what chronic diseases your parents, grandparents, and other relatives have. By having this knowledge, you can often learn whether or not you have a disease, or might be a carrier. In some cases, certain diseases like Alzheimer's is hereditary, but doesn't show up until later in life. However, if your family has a tendency to have this disease, it is often very likely that you too will have it once you reach a certain age.
High quality Sleep
Good body composition
Mental Clarity as an active lifestyle is one of the best mood inhancers there is
the answer is either 2 or 3 but I would go with 3