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Concerning casual or recreational usage, there is clear medical evidence that marijuana usage impairs, at least temporarily, cognitive function
Also, a more recent meta-analysis examining the impact of smoking on early response to infliximab by Inamdar et al
Sobsey, and John Scott Meschke, Virus Survival in the Environment With Special Attention to Survival in Sewage Droplets and Other Environmental Media of Fecal or Respiratory Origin, University of North Carolina, School of Public Health, Department of Environmental Sciences and Engineering CB# 7431, McGavran-Greenberg Hall, Room 4114a, Chapel Hill, NC