Medical marijuana to my knowledge is typically grown in a hydroponic system indoors. It's one of few plants priced high enough to make this worth it. My hope is that it can improve the tech & bring the prices down so that more crops can be grown indoors. A lot of companies have tried this on fruits & vegetables. I'm not aware of many that have been very successful yet due to the high price of this growing method but it could scale dramatically if the price comes down.

Travel is a huge pollution issue. I believe AR/VR will become an incredibly addictive technology down the road.

Short Term (1-5 yrs) - It'll chip away small amounts by offering another form of entertainment to keep people happy. I think it'll help improve business meetings in the near future as well.

Long Term - I could see it becoming a form of entertainment that reduces the amount of traveling we do. People go to the zoo to see animals because it's easier & cheaper than finding them in the wild. You can also get closer without them eating you or running away. VR will let you do a lot of things you couldn't do or would have to suffer a lot of hardship to do. I think it will also create false expectations of what the real world is like. So ya, I do think as VR graphics & physics get better, it'll replace a large chunk of traveling.