I have officially stopped using Smowtion on my websites.

Why? Simple.
On more than one occasion, while I was browsing my own sites, were advertisements displayed that redirected me off my site and to another that tried to get me to download things and harassed me with javascript exit pop-ups and more. I received reports of this from other visitors as well.

It infected the computers of at least one visitor.
A close friend of mine was browsing my forum, was redirected by an advertisement, and infected with a Trojan, and had all the photographic (screenshot) evidence to prove it.

So, if you want your visitors infected, stolen and harassed - go with Smowtion!