Absolutely not. You are free of smoking, why run the risk of getting back in the habit?
I have been using an E-cig for the past 3 months (V2 E-cig which is great), but before this I had used two others (intellicig and Tornado 510), both of which had problems which made them unuseable. I went straight back onto the cigarettes.
If my V2 ever broke and I don't have a replacement battery, or if I forget to order juice and leave myself short, or if the UK government ban imports of e-liquid, then I'll probably be back to smoking cigarettes.
Don't do it to yourself. It's not healthy either. I often feel ill from overdosing on nicotine (now I've cut down to 6mg this is less of a problem), or my teeth feel like they haven't been brushed (it sometimes creates a buildup), it's just the lesser of two evils. We have no idea what the long term effects of vaping could be, as no-one has been vaping for over a decade yet.
Don't start vaping, and don't believe all you've been told in the sales guff from various parties with vested interests. Also, although it's not nearly as expensive as smoking, the cost of cartomisers, the occasional replacement battery and the juices all add up. I find I'm spending around £30-40 per month on my habit, which over a year is at least £360.