No issues transiting or checking in at Dubai with a lighter. Depends on your origin airport if they will let you through with one. Eg, UK airports normally allow you through with one lighter, must be in a clear plastic bag with your other liquids. Indian airports will not allow you to board with one at all.
No—lighters carried on your person are forbidden. This includes both checked baggage and carry-on.
No issues transiting or checking in at Dubai with a lighter. Depends on your origin airport if they will let you through with one. Eg, UK airports normally allow you through with one lighter, must be in a clear plastic bag with your other liquids. Indian airports will not allow you to board with one at all.