Hey try using centella products. They are gentle onto sensitive skin.
BMI of less than 18 is considered underweight... However, when considering BMI, you do want to take into consideration muscle mass, height, etc...
Over 35 is obese
I would choose A, because having a BMI less than 35, 30 or 40 wouldn't be a risk factor.
Less people will have to inhale the second smoke from others due to smoking in public. Many people could have less health problems due to lack of second hand smoke inhalation
Stimulant drug I think would be the best answer