If your idea of a cigar is limited to a post-meal indulgence, CigarBQue hopes to change your mind — perhaps with a loaded potato bacon blunt. The nationwide celebration of cigars, 'que and booze makes its way through St. Louis this Thursday with a stop at Atomic Cowboy(4140 Manchester Avenue; 314-775-0775)— and they haven't just assembled any old crew. The event features the city's top pitmasters and bartenders: No less than Mike Emerson, Skip Steele, Tony Saputo and Chelsea Little will be serving up food and drinks meant to complement, and at times incorporate, cigars.…