The pre-filled disposables made by big tobacco companies you can't get 0 nicotine.
But the refillable tank units... you purchase your own e-juice and vendors sell juice in hundreds of flavors with nicotine levels per milliliter (ml) in strengths of 0, 4, 6, 12, 16, 18, 24 & 36.
There's also a booming DIY market where you can buy unflavored nicotine, vegetable glycerin (VG), Propylene Glycol (PG) and flavoring and make your own flavors and nicotine strength...
If you are going 0 nicotine... you can purchase Glycerin at a drug store and artificial flavoring at a baking supply store and make your own juice.
Angel there's a ton of vapers in Canada that are able to get juice with or without nicotine... Here's a great resource if you are interested...
http://www.e-cigarette-forum.com/forum/