This book is exactly what I am looking for: concise but still complete, clear but still nuanced. It may be too academic for certain readers' taste, but I am OK with it.
Other than reminding myself of the harm of addiction, below are a few key things I have learned:
• When we talk about addiction, we are talking about many things, including repeated drug use in face of harm, people's self-report of their mind being consumed by drug use, their experience of dependence, tolerance, and withdrawal. Individually none of these above is addiction. Instead, "Addiction in humans is a hypothesis that a group of things we can observe have an underlying connection, much as there might be a connection under the soil between a group of flowers we can observe above ground." I find this approach that defines a concept as a hypothesis that explains a group of phenomenon inspiring. Perhaps it can also apply to other human condition and behaviors, such as mental diseases, emotions, and romantic love?
• The concept "overdose" refers to acute and dangerous effects of addictive drugs. A more accurate term is “poisoning” because it can happen when people taking their usual or even lower dose. The term "overdosing" gives people a false sense of security, as if they are fine as long as they don't increase drug use. But people may get poisoned if their ability to metabolize the drug decreases due to aging, illness, or exhaustion. Some drug, such as heroine, always carry a risk of poisoning even for usual doses.
• Addictive drugs works by their power but also by their speed of action. They amplify the natural human tendency to value small, immediate rewards over larger but delayed rewards. This is tendency we must be wary of.
• Many people experience withdrawal after they stop using opioids as painkillers, but they do not go on using in an addictive fashion
• "To discount those feelings on the assumption that a rational person should be able to fully control their reactions in light of the brain disease of addiction is internally contradictory: it emphasizes the limits of control over behavior and affect for addicted people, without extending that understanding to the rest of humanity."
• It is controversial whether certain types of behavioral addictions are indeed addictions. One reason is that they do not cause nearly as much harm as drug addiction. For example, "although it’s hard to find people who inject heroin several times a day and are at the same time healthy, happy, and productive, it’s easy to find people who check their iPhone 300 times a day and are all of these things."