Generally The Smell Is not that Strong
Dab Pens Generally do not smell as long as your using a concentrate with low Terpene content. (Terpenes are the chemical compounds that give the concentrate its smell. )
Even dabs with high terpene count will be a fraction of the smell you normally get from normal smoking.
If you don't know which concentrate to get, its helpful to experiment with different concentrates untill you find one that works out best for your needs.
You can find a Pen designed for dabs here.