Addiction and substance abuse are complicated topics, but ideally somebody partaking of tobacco, drugs, or alcohol is aware of the risk to their own person of doing so, and has freely chosen to partake regardless. Unfortunately, though I'm well aware of the mortal danger excessively large and powerful personal vehicles pose to me and my family on the road, the only ways I can opt out of that danger are to a) not drive (edit: or walk, or cycle, or...) on public roads, or b) drive a very large and heavy vehicle myself, thus putting yet more people in mortal danger. Neither is acceptable.

In short, yours is not a good analogy because the danger posed by the use of harmful addictive substances is to the self, while the danger posed by driving an F-450 XLT Cummings Power Stroke 8.0 Liter Ranch King Harley Davidson Edition is to others.