That's not true at all. Drug companies bribe prominent doctors with multi-million dollar payments to convince other doctors that drugs are safer and more widely applicable than they actually are. If you refuse to take an opioid painkiller for fear of developing addiction, you are empirically demonstrating that you know more care more than your doctor about the risk/reward profile of the medication.
http://www.nybooks.com/articles/2009/01/15/drug-companies-do...