1) electronic cigarette refill e-liquid
2) DIY different e-cigarettes oil
3)e-liquid approve FDA certificate
4)e-liquid

    E-Liquid (Nicotine and PG/VG--- without flavors)Products Specification:  

   Nicotine and Prolylene Glycol
 2.40%- 3.60%- 4.80%  -7.00% -8.00% -9.00% -10.00% -12.00% -15.00%

   Nicotine and Vegetable Glycerin
  2.40% -3.60% -4.80% -6.00% -7.00% -8.00% -9.00% -10.00% -12.00% -15.00%