As someone sympathetic to the legalization movement, but has no desire to smoke, I've often thought that the people that want it legalized the most are the biggest hindrance to acceptance. Its almost as if during prohibition of alcohol, the only people that pushed for legalization were the alcoholics.
I personally cannot stand the smell at all, it instantly gives me headaches and I need to lie down for a while to clear my head. Strong tobacco does the same thing, but it seems it takes a lot more to disable me. I have several friends that I can't stand to be near any more because as the legalization movement has progressed, they have become bolder and bolder with their use and it REALLY hurts to be around them. Visiting an area where it is now legal earlier this year, I had migraines the entire time I was there. It was bad. I didn't want to go out at all, spending time only at the conference and in my hotel room. Of which it seemed to whift through the ventilation system even though these were supposedly non-smoking rooms. I had to ask to be moved twice.
Personally, I wish it were legal. I also wish the vast majority of the people I knew that smoked it cared more about others than their own addictions. And I truly believe it has to be an addiction because that many smokers can't just be jerks.