Hey there!
We have similar stories. I'm not a user at all (recovering alchoholic/addict) but my fiancé has Crohn's and the only thing that worked for her was weed. So I started growing about 3mos ago when I got sick of paying $600oz from the local dispensary. (yes...it's that much here!)
I just did a whole 4X8 for under $2K and it honestly rocks. Check out my grow-room setup thread, and my grow journal and it takes you through the entire build.
I'm only growing Autos so I can keep the light schedule the same. I'm planting 2 seeds every 2-3 weeks so I can always have a plant or two ready to harvest every month. That will net about 8-10oz a month, which is way more than she can smoke, but it lets me give weed to my friends too. Anyway - here's my shopping list.
Tent:
https://www.amazon.com/gp/product/B01DXYMSMM/ - $175
Lights: 2 of these -
https://www.amazon.com/gp/product/B07PLYR5HG/ - $270ea
(These come with the hangers and timers and temp gauges)
1 of these -
https://www.amazon.com/MARS-HYDRO-Commercial-Hydroponic-Greenhouse/dp/B07VPF7KKR/ - $479
Vent Fan: https://www.amazon.com/gp/product/B074XBXFPD/ - $150
Carbon Filter:
https://www.amazon.com/gp/product/B07YXPZR4P/ - $65
Hose:
https://www.amazon.com/gp/product/B0791V19H7/ - $25
Fan:
https://www.amazon.com/gp/product/B00FXOFM56/ - $25
That takes you to just under $1,500. You'll need the other $500 for stuff like fabric pots, medium, tools, PH meters, nutrients, and a million other do-dads that pop up here and there.
Oh...and seeds. Plan on $150 for those to get you started there. Order from either Seedsman.com (site sponsor) or HomeGrownCannabisCo.com - Both have a great selection of Autos if you choose to go that direction, and I've had no issues shipping to a "red state" thus far. They both also give you a lot of free seeds with your order, and often will do BOGO sales.
Good luck and PM me if you have any questions!