My Doctor has been brutally honest and told me to stay the hell away from it. We even sat and talked about it for a good 30 minutes and lamented how dumb so many people have become.
It's the people above them that are silencing them and threatening their livelihoods if they don't conform. Although, I have no doubt that there most certainly are Doctors who are as dishonest as you suggest.
I had one such situation in my family where the Doctor made it abundantly clear.