Having friends can be difficult but as long as you be yourself then the other person should accept you for who you are. Dont change for anyone. Making friends can be hard but there are many kind people out there in the world.
Eating junk foods & not exercising can cause the development of obesity which, in the "long run," can be a "factor" in the development of "lifestyle diseases" such as hypertension, hyperlipidemia and the like. Likewise, the "effects" of smoking cigarettes, like COPD (chronic obstructive pulmonary disease), will most likely manifest "later on."
When you mentioned "immediate," it's safe to assume that the "risk factor" your looking for can impact an individual with a "snap" of a finger; and accidents, as we all know can happen real time due to weather conditions, poor judgment, road mishaps and not exercising enough caution such as not wearing a seatbelt while manouvering the streets behind the wheel.
A birth defect, also known as a congenital disorder, is a condition present at birth regardless of its cause. Birth defects may result in disabilities that may be physical, intellectual, or developmental. These disabilities can range from mild to severe.