I'll tell you this much... Doctors make money off of the sick. Tobacco companies make money off of people that will most likely become sick. Health insurance companies are banking off of the sick and the dying. Tobacco lobbyists are funding the FDA. I'm not saying that doctors are as bad as the other four parties, not in the least. They are simply kept in the dark like everyone else. Luckily we have this forum and others like it.
Ignorance is most likely the main reason more doctors aren't recommending e-cigs. Ignorance on the part of the doctors, and the intentional ignorance of the FDA. Notice how there are there's pretty much no solid, official evidence or studies for e-cigs coming from the FDA? That's the influence of the tobacco lobbyists. Hence, physicians are kept in the dark, barring independent lab studies.
Tobacco and health insurance companies do not have a hand in the e-cig market, if they did things would be very different. Big tobacco would be bringing back Joe Camel for the kiddies and vaping would be heavily advertised. The bottom line is this, e-cigs hurt profits of the companies who make a fat living off of peoples' health.
Large corporations and other such entities are driven by greed and money. It is a strong belief in this country that everyone is entitled to make as much money as they can. It is a waning ideal that one should come by profit morally and honestly. It's hard to challenge an ideal, it's nearly impossible to challenge a belief. The best way around this problem is to try and change the means by which these vultures stuff their wallets, let them keep their horrible motives.
I'll finish up with something that blew me away when I heard about it. In Canada, with universal health care, doctors can sign up to a program that pays extra for helping patients to quit smoking cigarettes. Here in the US, healthcare employees get paid extra the more patients they drop. Don't believe me? Look up the name Linda Peeno, she was a physician who was contracted by the healthcare company Humana a while back. It's all about the profit.
Sorry for the essay, but it's the truth