It's not quite like the odd glass of wine you might have. People tend to smoke weed until they feel high, or "relaxed".
I know enough people who want a "hit" from their wine/beer/gin - otherwise what's the point ? Vaguely reminds me of back in the day, when people (men) bought Playboy "for the articles" 
Besides, one phenomena which is unlikely to be researched in any reasonable depth, is that in terms of analgesia and as an anti-spasmodic, it seems the therapeutic dose is below the dose that creates a noticeable psychoactive effect. Quite a few people that use it for the pain and spasms in MS (my hobby horse) actively dislike getting "high".
The medical whole-plant preparation (a tacit admission that you can grow your own medicine) "SativeX" achieves the same effect. If it were actually available via the NHS, quite a few people who have to rely on dealers would use it. But given the experiences in my neck of the woods, you'd be more likely to get a prescription for unicorn wee as SativeX.
All this talk of smoking should be balanced by noting that there are other ways to consume cannabis. Vaping aside, it's quite amenable to dissolving in fat, like butter. Which makes it possible to ingest it rather than smoke it, thus better for the lungs, and neighbours. In fact people who have access to a consistent source (generally by growing it themselves) can experiment towards making a titrated dose-per-bite medicine ... butter being useful for brownies and cakes. Although absorption via ingestion creates a different metabolic route which lasts longer, and leads to more CBD products.
Touching on recent events, the passing of Paul Flynn MP recently was a sad loss to those desperately seeking a change in the law to allow them legal access to a medicine they know works. He was a great supporter in a humanitarian way.