What was the 'of course' comment?
IMO it's not whether or not he NEVER smoked a cigar as much as it is the ONE TIME he wants us to believe he DID smoke one just happened to be THE NIGHT his wife was brutally murdered and it's his reason for exiting the hotel he was staying at that particular night.
A juror can be convinced that he both smoked a cigar when he said he did and murdered MY that night. The two are not exclusive IMO.