If you dont know what ur doing with some devices or have crappy ones, poorly made, they can explode or burn. It is your duty as a responsible adult to look into these dangers, seriously. And watch out for shinyitis, the addiction of buying new gear.
vaping is only cheap if you want it to be. I go through 10 mls a day and am always looking into new gear now. Already know what I'm buying next. Freemax starre pro sub ohm
tank and
coils. Going to wait til I get my last purchase in the mail first though, a black ipv4. Its on its way from china right now...grr.