These are completely original, by the way… this stuff wasn't lifted from a quote file or a humour website. Pure home-grown jocularity, mixed with the colonel's secret recipe and inhaled through the barrel of his rifle… ;)
Reasons Why Sherlock Holmes Was A Stoner
He needed something non-addictive to get himself off the cocaine.
He never left his tobacco lying around, preferring to stash it in a Persian slipper.
He thought that the law sucked and should be reformed.
He wore a dressing gown around the house because he had other priorities.
He snacked rather than sitting down to proper meals and got Mrs Hudson to bring him munchies at odd hours.
Finally, the biggest clue that Sherlock Holmes was a big stoner:
He sat up all night, smoking and trying to work out what was going on...