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The hallucinogen that makes marijuana users paranoid can also decrease testosterone and sperm production. That could lower your sperm count and hurt your chances of conceiving, although researches say the effect can be long or short term, depending on the person.
More importantly, a regular user should have their doctor or dentist check their mouth annually for precancerous lesions that show up in the form of red or white patches. While your lungs will get better after 15 smoke-free years, mouth and throat cancers can take 30 to 40 years to appear.
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