- It's private
Of course, we all want personal information about the stars that we love, but it's really not anyone's business whether or not Kendall Schmidt smokes or not. Hopefully, he is a non-smoker, since smoking is really unhealthy and it doesn't have any positive elements. Chances are, since Kendall seems to be involved with fitness, and is in very good shape, that he respects his body and stays off the cigarettes. In fact, this young actor may never have smoked at all.
- Ask him
If you really want to ask Kendall about this issue, try to contact him via his Facebook or Twitter. Sometimes, celebrities will respond to others who message them on social networking services. Just be sure you are as polite as possible, or you may not get a response. In general, stars like Kendall will only respond to a few tweets or Facebook messages from fans each day.
Kendall's management or the production team at Big Time Rush may also know whether or not he smokes tobacco; however, contacting them about the matter is not a good idea, as they will be unlikely to paint him in a negative light by "outing" him as a smoker. Social networking is really your best option for finding out the truth.