Prolonged and constant use of tobacco can weaken the user's immune system and increase the risk of many diseases.. which of the following diseases can makes the air sac in the lungs less elastic, reducing their ability to absorb oxygen? .
a. chronic bronchitis.
b. emphysema.
c. lung cancer.
d. oral cancer.

Which nutrient is the most difficult to break down and, thus, is generally used last fro energy in the body? water carbohydrates fats proteins

Which of the following will abstinence most likely to improve? a. creativity b. physical strength c. flexibility d. emotional health

What is one reason that informed consent is important for patients? a. patients have complete access to health care with informed consent. b. patients can make the best decisions with adequate information. c. informed consent brings the cost of health care down significantly. d. informed consent leaves a written record of the patient's consent.