While a little on the danger side (since vape base is basically steam not smoke) it is a good option for a quick test. Back in the day we used cigarette smoke since almost anyone smoked but the odour is a problem for non-smokers, the vape method doesn’t smell at all and without flavours or nicotine it doesn’t leave stains as well. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.