Before lighting your cigar you must cut the closed, capped end off the cigar before you can smoke it. The closed capped end of a cigar is where you put your mouth and you must cut it to allow proper air to flow through the cigar, otherwise it simply won’t draw.
Knowing how to cut a cigar is important because a bad cut can damage a cigar and ruin how it smokes and tastes. You only want to remove the outer layer of wrapper. It is always better to cut too little than too much. Cut before the cap, leaving 3-4 mm or 1/8th inch.
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Source: cheaphumidors