I would expect to hear from a fair number of recovering alcoholics ~ folks who used to drink, learned that they couldn't handle it, and now avoid alcohol completely. I know plenty of middle-aged musicians (not necessarily folkies) who fit into this category. Spending lots of time in barrooms is an occupational hazard for these guys, of course, but they generally manage to control themselves, ordering plenty of soft drinks and bottled water at inflated bar prices (which undoubtedly pleases the bar owners).

The number of lifelong teetotalers ~ those who have never taken a drink ~ is undoubtedly much smaller, perhaps negligible.