The main benefit of using hairspray without alcohol is that it does not have the same drying effect on hair as products that us an alcohol base. Alcohol can make hair look dull, lifeless and frizzy, and cause flaking around the scalp.
While short-term exposure to hairspray with alcohol in it rarely causes serious problems, long-term exposure and regular use can cause serious damage to hair. Alcohol is typically used in hairspray as a thickening agent, as well as a preservative to keep the hairspray from spoiling or attracting microbes. Alcohol-free hairsprays typically use glycerine or plant extracts in place of alcohol.