Smoking and Parkinson's disease: Systematic review of prospective studies

@article{Allam2004SmokingAP,
  title={Smoking and Parkinson's disease: Systematic review of prospective studies},
  author={Mohamed Farouk Allam and Michael J Campbell and Albert Hofman and Amparo Serrano Del Castillo and Rafael Fern{\'a}ndez-Crehuet Navajas},
  journal={Movement Disorders},
  year={2004},
  volume={19}
}
We estimated the pooled risk of tobacco smoking for Parkinson's disease (PD). Inclusion criteria included systematic searches of MedLine, PsycLIT, Embase, Current Contents, previously published reviews, examination of cited reference sources, and personal contact and discussion with several investigators expert in the field. Published prospective studies on PD and cigarette smoking. When two or more studies were based on an identical study, the study that principally investigated the… 
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TLDR
The risk of PD in relation to smoking is strongly modified by age; smoking may be protective in the younger cases but not in the older cases, and this finding may explain the conflicting results from previous studies.
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TLDR
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A protective association of cigarette smoking for Parkinson's disease may constitute an important etiologic clue.
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TLDR
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TLDR
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TLDR
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TLDR
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TLDR
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