Everybody lies, even doctors. Just because they went to school for a long time doesn't mean they aren't easily swayed by pharmaceutical drug pushers. This is why the supply chain transparency in healthcare will be a great means of blatantly revealing unnecessary, deadly, and highly profitable over-prescription.

As for the smoking? The doctor probably has a broader view on human health, knowing that no matter what we do, we're ultimately only alive for a very short time and it's all mostly suffering anyways (until we achieve digital immortality of course) so fuck it.