I believe it. Everytime my friend dabbled, his heart raced. That said, there are so many third variables that are associated with adult chronic usage (no pun i

I believe it. Everytime my friend dabbled, his heart raced. That said, there are so many third variables that are associated with adult chronic usage (no pun intended) of marijuana that covariates may have a hard time removing their influence. What is needed is a mechanism, shown in animal and cellular models with random assignment. I haven't had the chance to read; was one proposed?