How do I get my hair to not smell like smoke?

OK, so just over a week and a half ago, I was in the place where I work when a restaurant on the floor below us caught fire. Well, the place filled up with smoke, and when I went home a couple hours later (no, don't even ask why there were no fire alarms or evacuations. It wasn't my choice) you could smell smoke when you got within 6-8 feet of me. Naturally, I washed my hair and my clothes as soon as I got home.

So, here's the problem: It's my job, so I end up being there about twice a week. The smoke smell was only bad the first time I went back after the fire (we didn't close or stop normal operations at all) but my hair still smells like smoke ALL the time.

How do I get my hair to not smell like smoke, or for that matter, smell like anything other than smoke? I already wash it every morning, and on days I go to work I wash it as soon as I get back cause it smells especially like smoke then. But, I've washed my hair at least three times since I've last been at work, and the smoke smell still isn't coming out. What's the problem here?