Most people who have a medical need can grow these days and a grow tent makes apartment growing possible. In the states $20 (20 x17 watt 100 W equivalent of LED light bulbs, 2400K) can flower out 3/4 of a pound (320 watts) of pot every 70 days or so and another small veg area can provide the starting point and clones. It should meet the needs of most or at least save a lot of cash and the trim can be used for a variety of things. Mostly those with medical needs will grow, both to meet their exact needs with the right strain and to be able to afford it. Even if it is technically illegal in many places now, it is not enforced much, unless you are larger scale.
In Canada a typical prescription for 3 grams a day allows you to grow 5 plants per gram, so 15 plants! I gave up my prescription and never renewed when it became legal, I don't grow a lot and nobody is checking, if I wasn't giving so much away, four plants would be more than fine, too many in fact. I gave up smoking pot recently, but I still have a few brownies in the freezer and I'll have one at Christmas, though since I haven't been smoking I'll have to be careful, they are very strong brownies.