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found this
Dry Pipe:
1/16.2 C/T
~30% of THC in sample
Single Percolation Waterpipe or Bong:
1/16.9 C/T
Small waterpipe ~25%, Bong ~15% of THC in sample
Unfiltered joint:
1/13 Cannabanoid/Tar
~20% THC in sample
Filtered joint:
1/16.9 C/T
<20% of THC in sample
Hotplate Vaporizer:
1/9.75 C/T
~10% of THC in sample
Modern Hot Air Vaporizer:
~9/1 C/T
~60% of THC in sample
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