Im a bit of a long term vaper i dont even remember how long ago i swapped it for smoking its 4-5 years now though.
I am a bit of a tightarse and had my screwdriver mod for over 2 years until it started to get a bit rare to find the 901 attys so i bought myself a lavatube 4 and an aga-t2 rebuildable atty.
I mix my own juice and managed to get my nicotine base imported from the U.S. 100mg strength 500ml of it and managed to talk them into labelling it as 4mg pg base labelled with a value of $20

(shove the VAT up their bumholes)
I buy VG from ebay for about £6 a litre and buy tobacco flavouring from liberty flights and make my juice up to about 18mg in strength.
buying a rebuildable atty was about the best investment ever i use steel rope as a wick and the wire to make your own coils is dirt cheap too much cheaper than buying atomisers.
All my nicotine,glycerine and flavouring come from sources with pharmaceutical standard ingredients.