home made juice

Hey guys!, how are you? I am a little worried because i dont know how to check if the flavoring contains or not oil and other chemicals that could harm my lungs and my hardware. What should i ask/check before buying? I know that a flavor is good when it is water soluble, without any artificial...

1). Whats do you love about the E-Liquid? 2). What nicotine level do you prefer? 3). VG/PG blend % 4). Where do you get it ? 5). Do you make your own?