I would be more concerned with the difficult overly critical & dramatic personalities displaying themselves on here (showing a lack of sense of proportion, kindness or tolerance to others and to OP's actual posts) than whether a smoking neighbour might, with all the many other variables, be associated in research with lower educational attainment, class or groups of personality traits...
There are a number of traits that correlate with certain other groups with protected characteristics, and most of us recognise that it's pretty poor form to make generalised statements and assumptions about other people.
@Bellasorella makes a good practical suggestion
try find the wind direction so it goes away from their garden
A nice way to try to be mindful to NDNs 
My experience is a tall full laurel bush or potted bay tree helps with a physical barrier for garden smoke of any kind (at sides of my house by back door) so really cigarette smoke from my NDN is more likely to go up & over head than my height.
A PP misquoted me earlier (they hadn't RTFT) about being asthmatic and "feeling sure I'd live" if a bit of cigarette smoke wafted over, when it was in reply to a 'think of the asthmatics you are killing off' (by your occasional wafting smoke outside) type comment earlier to that.
I definitely appreciate people being thoughtful but I wouldn't impose by negging on NDNs who are sensibly smoking outside - unless they were chain smoking right under my open window.
As someone who is asthmatic, I can tell what hits air quality more- it's far more noticeable with excessive car exhaust, bonfires and smokey BBQs that go on all evening, and from further afield, than someone smoking outside in their own garden. (Any smoking in same enclosed room is different).
Someone who smokes 10 a day is likely to only smoke only a number of those outside in their garden and the rest when out, so I doubt OP is even smoking for 50 minutes (10x 5 mins) maybe nearer 20-25 mins, of the whole day outside the back of her own house in her own garden in open air.
OP made a genuine point about NDN being passive aggressive repeatedly when most nice NDNs would have found a different way to approach it. She also said she had reasons for needing to smoke as a crutch right now, important to her mental health following some traumatic experiences and has had to endure a number of PP's slating posts about her likely being neurotic, thick, a moron and other similar derogatory posts. None of which I think were kind nor neccessary. I suspect OP is probably a nice NDN as she found it upsetting rather than made her shout back to them or react unpleasantly.
It's slightly shameful how some PPs have berated this OP.