In the film Thank You for Smoking, Nick Naylor’s job was to justify the use of tobacco and turn its harmful effects into something positive by using numerous tactics and defending the tobacco industry.
I think that personal morals are sometimes challenged when you enter an industry such as the SIN industry, where the sole purpose is to sell goods or services commonly understood to be unethical, immoral, and socially detrimental, such as tobacco, alcohol, gambling, adult entertainment, and weapons.
Yet, the individuals who are a part of the SIN industry not only have to deal with their own moral compasses, they also have to face the sound of the public, whether that's scrutiny from individuals, reputational damage, or social stigmas placed upon them; it is simply a part of the professional territory that they work in.
It is pretty hard for someone with strong beliefs in something as big as this to defend one who makes a living off of defending and representing something that simply cannot be defended or excused, solely because it is morally unacceptable.
On the other hand, morals tend to become outweighed by the mention of money. If one were offered a starting pay of $200,000, morals and social scrutiny would be placed on the back burner, and someone who does not consider what society thinks would thrive in this position and would thrive in life with the large paycheck.
Personally, I am not one to care much about what outsiders have to say, but I do cherish the perception that my loved ones have of me, along with the self-satisfaction I feel for my beliefs and actions, so I could not take on a job like Nick Naylor’s and actively be an enabler and have to deal with the possibility of my actions fueling someone's addiction or possibly having a hand in someone creating an addiction due to the products that I am endorsing, not even for one million dollars.
Advertising for these products, such as being placed in movies, on billboards, or even on the internet, is not restricted and is unlikely to become outlawed because it is considered and protected as "commercial speech”. As long as the speech in the ad is not false, misleading, or deceptive, then it is protected and able to be shared with others.
These products, though morally and socially unacceptable, will never fully be banned and deemed illegal because it is much more dangerous to try to get rid of the products than to ban them. This would lead to unregulated products, the acts of using and/or selling these products illegally, and numerous other dangers.

On January 17th, 1920, the 18th Amendment was put into effect. This amendment prohibited “the manufacture, sale, or transportation of intoxicating liquors”, leading to the rise of speakeasies; these were hidden establishments requiring a password, so one could access the social hub that sold alcoholic beverages and provided individuals with live music and dancing.
These establishments were dangerous, and thousands of people died from consuming the unregulated alcohol they provided. Many speakeasies had alcohol that was made from inexperienced bootleggers, who included industrial alcohol, which is made for use in fuel and medical supplies, in the drinks, which led to the high risks of being blinded, poisoned, or killed.
The government essentially forced these companies to make industrial alcohol undrinkable, and this, along with the terrible and low-quality products that the bootleggers used, created a recipe for disaster.
This is one of the many reasons the SIN industry is a necessary evil and will continue to thrive as time passes, because someone must take the job of defending the indefensible.

