i learn from the experts here,buy by the Kg PG e-liquids(1/2 Kg is over 500ml) with nicotine,preferrable high strength..dilute with 0mg VG(for optimum vapor 30% to 75%)..add any flavors till yr heart contend..but since i only vape mint to spearmint flavors & tobacco..i get to taste similar to what i used to smoke on analogs..little care in storing large amount of e-liquids(if normal condition 2 years shelf life,i was told) however i put my bottle of e-liquid in the freezer..hopefully can extend the shelf life in doing so..so vape till i am contended..was using 2 ml,now over 3+ ml per day using my EGO-T tank..happy vaping every1..regards mafig