Cramping in your feet (or muscles) could be caused by tension or
a) not enough sleep
b) too much vitamin d
c) dehydration
d) stress

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.