Ok so speaking from my personal experience, the smell WILL become a problem. My first grow was very similar to yours, I had 3 plants under a 250 halide and a 150hps in a 2x3 space. I thought that the smell wouldn't be an issue cause I smoke all the time anyways. Well ya, live growing plants in flower have a smell that really sticks with you and even to the point of annoyance when you can't escape it. When you walked up to my front door the smell would just slap you in the face.
My advice is to buy a scrubber or some gel. There are lots of inexpensive ways to go about smell control, do some research. But if you don't belive me and let the smell build you will only appreciate the scrubber you eventually buy that much more.