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The newer drugs release the blockade, allowing immune cells to clear out the cancer cells

However, for habitual smokers or those who use other tobacco products regularly, cotinine might be detectable for a longer period, up to 2 weeks or more, because of accumulation in the body

These include: Tar - a mixture of dangerous chemicals Arsenic - used in wood preservatives/ rat poison Benzene - an industrial solvent, refined from crude oil Cadmium - used in batteries Ethanol - used in anti-freeze Formaldehyde - used in mortuaries to embalm dead bodies Polonium-210 - a highly radioactive element Chromium - used to manufacture dye, paints and alloys Acrolein - formerly used as a chemical weapon Hydrogen cyanide - used as an industrial pesticide Carbon Monoxide - contained in exhaust fumes Ammonia - used to make fertilisers and explosives Smoking damages nearly every organ of the body

IARC (International Agency for Research on Cancer)