I don't usually ask, with the exception of private homes/vehicles.
Like Ryan said, above, I tend to pay attention to where I am. The more crowded it is, the more likely I am to either stealth or wait.
But you're talking about while you're at work, at customers job-sites. In that case, I would probably either ask, or perhaps stealth if I was confident nobody would know. I wouldn't openly vape without asking, just because it's not worth losing a customer or a job.
Like Ryan said, above, I tend to pay attention to where I am. The more crowded it is, the more likely I am to either stealth or wait.
But you're talking about while you're at work, at customers job-sites. In that case, I would probably either ask, or perhaps stealth if I was confident nobody would know. I wouldn't openly vape without asking, just because it's not worth losing a customer or a job.