Answer:
obstructionist.
Step-by-step explanation:
When tobacco companies sought to hide evidence that cigarette smoking causes lung cancer, they were exhibiting an obstructionist approach to social responsibility.
An obstructionist approach can be defined as an act of blocking important and essential informations from reaching or getting across to the general public and an interference with social responsibility.
Hence, the tobacco companies were largely or more concerned with making profits rather than enhancing social responsibility among the consumers of their products, thereby refusing to inform them that cigarettes smoking causes lung cancer.