Lamar Odom is recalling his own experiences with street drugs in the wake of Liam Payne's toxicology report ... telling us the substances could have made the late singer hear voices.
We got Lamar in Encino, CA and our photog asked if he had ever used the drug cocktail known as "pink cocaine" ... a mix of ketamine, methamphetamine and ecstasy that police say was found in Liam's system.
A TRAGIC WAKE UP CALL TMZ.