What are 2 religions that would prohibit blood transfusions?

Jehovah's Witnesses do not allow blood transfusions, as 'Blood represents life and Is sacred to God. Christian Science also ban blood transfusions within their religion, as 'They rely on Prayer'

Jehovah witnesses and christian sciences 

It can be peer pressure, also when they’re going through a lot of stuff at home

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases.