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i have a theory that man has had thousands of years to become resistant to indiginous plants but in the last 200 yrs we have started to export and import plants from all around the world exposing us to pollen we are not resistant to could this be the reason allergies and asthma seem to be on the rise?. any experts out there who can make sense of my off the head theory , im a welder not a doctor and would be intrested in any thoughts.
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