I applied the model of reasoning to something we could both agree would be bad.
It's still a false analogy. Better to compare him to a Jew who deliberately and conciously chose to travel into a State where he knew being Jewish would result in him dieing. Even then I'm pretty sure that's some kind of logical fallacy, we're not comparing like with like.

On heroin, read my post on the first page, it's instantly and physically addictive. We're not talking about getting a liking for smoking a few spliffs after work. The two drugs are realms apart, even harder drugs don't come close to heroine in sheer addictability.