is weed just as bad as cigarettes Adding tobacco to cannabis doesn't affect the high, but impacts memory and heart | UCL News Penn study: Marijuana doesn't cause
Penn study: Marijuana doesn't cause bad behavior it's the other way around WHYY Professor explores marijuana's safe use and addiction Harvard Gazette Cigarettes or Marijuana: Which Is More Harmful? Mythbusters: Cannabis 20 times more carcinogenic than tobacco? NZ Drug Foundation Don't smoke it with tobacco: scientists suggest ways to make cannabis safer Cannabis The Guardian
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