Cigars and tobacco contain nicotine which can make you feel nauseous, dizzy and sweaty. These symptoms are caused by a overdose of nicotine from a strong cigar.
Nicotine is both a stimulant and relaxant. It is absorbed through the inner lining of your mouth from the cigar smoke. It then goes straight into your bloodstream.
Advice: Limit your exposure to cigar smoke until you have built up a tolerance for nicotine.
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Cigars crack mostly because the wrapper leaf has dried out. Some cigar wrappers like the Cameroon wrapper are very thin and fragile and can dry out quickly if not stored correctly. Cigars can also crack if they are crushed or compressed on the sides like if you squeeze one.
If you have a cigar with a crack near the foot, you can cut the cracked section off so you can still smoke it. If the crack is in the middle or close to the cigar cap, then it is un-smokable.
Here is a cracked cigar where the crack ruined the cigar and now cannot be smoked. I had it replaced by the cigar retailer.
A sealed box of cigars will last about 30 days before the cigars start to dry out if they are not placed in a humidity controlled environment like a humidor.
All cigars should be kept in a humidor if you do not plan on smoking them before 30 days.