Avoid stretches which:
a) hyperextend the neck
b) over bend a joint
c) compress the vertebrae
d) all of the above
i think it's d not sure

i you dhdbdjdhd

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.