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When you purchase a bottle of e-liquid you may be given the option of either a Singler or a Doubler. What do these mean and does it matter if you make the wrong choice? Singlers Singlers are a full bottle...
When you purchase a bottle of e-liquid you may be given the option of either a Singler or a Doubler. What do these mean and does it matter if you make the wrong choice? Singlers Singlers are a full bottle...