Abhorring the Dull Routine of Existence, or, a Week Spent on Artificial Stimulants (смешанная)

Sherlock tries out more legal varieties of stimulant. Cracky spin-off fic set before the events of You Can Imagine the Christmas Dinners. Technically (given the events of the latter), this is pre-slash Sherlock/John, but it can easily be read as gen.