Ryan has been periodically using a substance that makes him…

Ryan has been periodically using a substance that makes him feel good, improves his sensory experiences, causes hime to experience mild but pleasant hallucinations, and makes him increasingly introspective about himself and his surroundings. Indeed, while Ryan denies any physical dependence on the substance, he does say that he is far more creative at work when he uses it and increasingly feels the urge to use it because of that. What substance among the following is Ryan most likely using? 

Matt has been consuming alcohol for years and over the last…

Matt has been consuming alcohol for years and over the last half year his consumption has become more frequent and problematic. While Matt recognizes that his drinking is problematic, he also believes drinking is an important part of his lifestyle and means to cope, and he is rather ambivalent about the idea of changing.  According to the Transtheoretical (Stages of Change) model, Matt would be classified as being in the contemplation stage of change.