When you buy your weed you buy wholesale and sell retail. That means you have a couple of units you can sell for pure profit - or use personally. You only need to sell a small amount to earn a commission that will have you stoned all day...which will be helpful as you kill time waiting for people to drop by and pick up your sales. It is totally possible to be a chronic and sell pot and not get into any money trouble. If you sell only a bit and smoke all your commissions you will never get rich, but if you sell just a bit more you'll have both smoke for yourself and commission. There's only so much pot you can smoke in a day.
Nothing found in Smich's room to indicate that. Where is the scale? Where are the baggies? Smich is a casual user, he always has a little bit and probably constantly hits up buddies to smoke their supply. There is a huge difference between users and sellers, and I guarantee you Smich isn't a seller.