Deluge of comment spam

This blog has received a deluge of attempted comment spam recently. Spammers attempted to post over 150 comments since the beginning of June. I say “attempted” because every comment made to this blog by a new user is sent to moderation; I have had to manually delete every spam comment made so far. I don’t know what the spammers are hoping to achieve, given I am not interested in illegally acquiring prescription pain medication, and nobody else has seen their missives on this topic they have tried to post here. But going forward, I guess I’m going to have to leave comments off.