The 1998 US Army document ‘Bioeffects of Selected Nonlethal Weapons’ says “investigators are even beginning to describe similarities between microwave irradiation and drugs regarding their effects on biological systems. For example, some suggest that power density and specific absorption rate (SAR) of microwave irradiation may be thought of as analogous to the concentration of the injection solution and the dosage of a drug.” 
And, as the ‘volume’ or power density is turned up on microwave transmissions, with increased antenna towers, Wi-Fi, Wi-MAX, mobiles etc., we now receive a microwave dose often millions of times higher than what was studied 20 years ago.
History in a nutshell
Post WW-II military radar applications led to the 2.45 GHz household microwave oven. The same microwave radiation is now used to communicate. Recently Australia’s spectrum was sold off to telcos. Desirable blocks including 700 MHz or 0.7 GHz (penetration), 900MHz and 2.6 GHz (data throughput) bands were acquired.  Microwave exposure limits around the world in 2016 are based on obsolete military-derived thermal effects limits. According to the standards if your flesh does not cook you are ‘safe’. Yet adverse biological effects occur at exquisitely low levels of exposure.