Hey BB, it's very much rife.

A client of mine who operates a well known establishment has told me on many occasions that her biggest issue with the staff is the amount of dealing that some of them become involved in whilst at work and once the door closes.

The numbers that your WL friend mentioned to you are very much on the mark and possibly a little conservative. Over time i have become quite friendly with a number of WL's and ML's, it never ceases to amaze me how many of them are doing Ice and on a very regular basis, but what is more astounding is some of the excuses for using "it helps me with my energy levels"..."it helps me control my weight"..."it helps me forget about this job"... the non glam and non designer label side of those occupations.