"Like I said, google it. I'm not as passionate about this argument as some people are, therefore I'm not going to do the leg-work for you. The studies I read were from valid sources. If you would love to see some peer-reviewed academic studies, they are out there, have fun And btw, I'm assuming if you don't research it, your opinion on the issue and other people's stereotypes regarding this issue are only as valid as theirs."
Instead of using Google I used an academic search engine. My findings are below:
"Prostitution follows addiction in 48% of the subjects, precedes it in 38%, and is simultaneous in 14%"
(James, 1977)
"They found that the average age at first heroin injection and first prostitution was similar (19.0 years for heroin vs. 19.2 years for prostitution) and that
44% had used heroin prior to prostitution entry, 26% subsequent to entry, and 30% at about the same time as entry."
(Gossop, Powis, Griffiths, & Strang, 1994)
"To assess the sequence, timing, and prevalence of sexual and illegal drug use milestones in prostitute women, we interviewed 237 prostitutes in the community and 407 comparison women at an STD clinic. Drug use was more commonly reported by prostitutes than comparisons [...]
Sexual- and drug-related milestones occurred in the same order in both groups, with drug use preceding sexual activity and injecting drug use preceding prostitution. Ninety-four percent of prostitutes who injected drugs reported noninjectable drug use before prostitution, and 75% of prostitutes who injected drugs reported doing so before beginning prostitution. [...] Currently, there is little theory to guide our understanding of why such events occur in the order they do.
The available data suggest considerable variation in the forces, both internal and external, that affect women's lives and move them toward drug use, drug injection, and prostitution (in some order). At least one pulp fiction version would have us believe that women are lured into prostitution by drugs and that the latter serves to maintain the former, but the available literature suggests that
the true situation is more complex and heterogeneous."
(Potterat, John J., Rothenberg, Richard B., Muth, Stephen Q., Darrow, William W., Phillips-Plummer, Lynanne, Journal of Sex Research, 00224499, Nov98, Vol. 35, Issue 4)
The general consensus seems to be that drug use and prostitution are related, and the relationship varies depending on the individual. Drug use is particularly problematic among street prostitutes, where drug users become prostitutes to pay for their addiction, and their addiction contributes to an overall stressful work environment (which is in turn relieved by more drugs).
Escorts sometimes begin drug use after beginning regular sex work, but the link seems to be more
facillitative than
causal (that is, people want to do drugs, but cannot until they get a job which allows them to afford it. This is similar to any job which comes with a substantial increase in money, such as a business executive) Drug use in general is far rarer among escorts than other prostitutes, and drug use is
discouraged in the world of "high class" prostitutes in general:
"Demographic analyses indicate that
regular drug use is less common among the higher-paid prostitutes than among the lower-paid group. There is no evidence that women are coerced into prostitution by third parties using drugs to 'enslave' women. However, women who are addicts and are more likely to encounter the criminal justice system may become prostitutes.
Subjects generally agreed that drug use was opposed by pimps and madams, and that addiction precluded the possibility of working as a call girl. Drug use and possession is felt to deter the entry to better occupational levels, invoke police harassment, and detract from the prostitutes' 'professionalism.'"
(GOLDSTEIN, P. J. RELATIONSHIP BETWEEN PROSTITUTION & SUBSTANCE USE; 1978, 379p)
In short, yes, drug use is more prevelant among street prostitutes in particular, the drug use often being the reason they begin prostitution.
Escorts, like many other people working in high-paying jobs, have increased means to engage in recreational drug use, but it is discouraged in the "escort culture" generally.