Yes, I think many, if not most, TV evangelists have inadvertently exalted themselves and have become their own stumbling block. If true, they are sending mixed messages and falsehoods to both believers and non-believers which is not a good thing? Take Joseph Prince, for example, whom I think is blessed with brilliance helping believers understand the differences from being under the Law (Old Testament) and in Christ (New Testament). Yet he also preaches that water baptism means that all yours sins are forgiven; past, present and future which I believe may not be correct? Otherwise, a Christian could commit every sin including murder in the "future" but those sins are forgiven? I don't think so? Bottom line, 'TV evangelism' has perhaps gone way over the top and is out of control?
Smoking is likely an unwise and unhealthy practice, but the real sin in anything like this is in overindulgence and habitual practice.
Mountain climbing, especially without safety equipment is likely an unwise and unhealthy practice, but what is the real sin in overindulgence and habitual practice of that? However, I appreciate the point you're trying to make and I think we know much less about demons. Blessings.