[6] During 1971-1973 he conducted postdoctoral research in physics in Group A at Lawrence Berkeley National Laboratory, under the direction of Nobel Laureate Luis Alvarez and Professor Arthur Rosenfeld.
[11] This study, published in BMJ in 2003, concluded that "The association between exposure to environmental tobacco smoke and coronary heart disease and lung cancer may be considerably weaker than generally believed.
[13] Michael Thun of the American Cancer Society criticized Enstrom for not informing the ACS that he had requested or received funding from the tobacco industry.
[11] In September 2006, the ACS sent the University of California, Los Angeles a letter charging Enstrom with misrepresenting scientific evidence to deny that passive smoking was harmful.
[2] The following year, the judge in this case, Gladys Kessler, ruled that major tobacco companies were guilty of racketeering and misleading the public regarding the dangers of second-hand smoke, citing the paper co-authored by Enstrom in the BMJ as evidence of this.
[11] In 2010, the University of California, Los Angeles School of Public Health announced that it would not be rehiring Enstrom because it felt his research was "not aligned with the academic mission" of their department.