Addiction can come in any form and by any means, if we failed to properly positioned ourself to how we are trading, not only on trades can we have addiction, this also exist in every other thing we may be doing wrongly from the usual way it is expected to be done, we also have to consider that addiction in trading could come in many forms and also cost us, because we are not going to be addicted only, but also lose more trading fund at the cause.
Addiction is always a result of a lack of understanding. When people choose to approach something solely based on their own understanding, it will always lead to addiction. Addicted traders don't understand trading. While learning trading, lacking knowledge of the effects of greed can lead one to addiction. If traders make learning the first priority, I don’t think it will be easy for people to get addicted to trading after gaining a good understanding of how risky and unpredictable the market is. With an understanding of trading, the only choice one has is to trade accordingly.
Ignorance is a cause of addiction but it is not the only cause and not all trading addicts don't understand trading. There are many people who know the risks and consequences of overtrading but they still continue to trade and the reason could be because they cannot control their emotions.
Like gambling addicts, no one understands the harmful effects of gambling better than them and they always advise people to stay away from gambling, but they cannot stop gambling. Obviously their addiction is not due to lack of knowledge but may be due to psychology, environment...