Probably not any of those since it'd be a waste of my talent, training and interests. The porn one is the most realistic as I could at least work on the back end of their websites or something.
That said, if I were suddenly in dire enough straits to be looking for a job and any of those would have me...
Porn can be done ethically and safely, so if the company I was considering did so, sure, why not.
Probably not a car salesman, I'm just not personally charismatic enough.
Drug traffickers? Eh... no, 'cause the risk-reward is too heavy on the risk. The real reward/profit goes to the people far removed and as an entry level trafficker I'd be the first under the bus. Just not worth it. I'm also for the legalization of all drugs and letting people take what risks they want with their own bodies, so you could even say I'm opposed to the job being able to exist.
Politician... eh. I'm not suited for the charisma side of the job. I'd be better as the assistant or material expert that advises and informs the politician. Which is actually something I would like to do. Spending a year or two in DC being the go-to guy in support of weapons projects when Congress has questions? That actually sounds really interesting to me.
Soldier... eh. I'm not suited for it and again, it'd be a waste of my skill/training/so-on. I'm happier being the Q to the 007, even if in the real world both of those are hundreds of people.
Tabacco PR rep [sic]? Um... no. While I have no moral opposition to people willfully and knowingly poisioning themselves, I have no intention of lying to people to get them to do so.