I don't really enjoy smoking in public. While I might enjoy the bowl, I can sumpatize with others who do not. I often get irritated by people puffing away at cigarettes in paths where I must cross with my child, or cigar smokers outside cafes where every bite I grab tastes like tobacco.
I smoke where I know people can avoid sharing the experience if they wish with very little effort.
On the roof at work, I'll choose a more isolated corner, and those who don't mind or enjoy it join me of choice.
The issue at hand is not that pipes are disappearing due to under exposure, but rather that smoking is generally not popular due to a growing awareness of its potential ramifications.
It might be riddled with absurdity as other problems such as obesity or alcohol consumption are not addressed as harshly, but it's a part of the going trend of being extremely concerned with health, along with a lot of money spent on advertising the dangers of second hand smoking.
Granted we each have our poison of choice, be it coffee, nicotine, alcohol or other harmful meant of recreation, people and governments are placing a greater emphasis on tobacco these days.
I'd rather make smoking not an issue worthy of anymore attention by ensuring I subject only myself to the consequences and leave others to their choices.
Regardless, I like chilling when I smoke, and therefor doing it while occupied with anything else diminishes the experience, and so I usually choose a place where I can not be overly conscious of my surroundings and at a time of leisure.