Im agree with gobigorgohome. Maybe not all, but many (at least me) tried to replace with marijuana or (put your drug here) or some other substance to evade some shortcoming /problem. Yes, it can be really a recreational drug use (or maybe not), but for one reason or another we chose that and not "paragliding" for example.
The HPPD made me realize that drugs its just a feeling, an emotion we are buying, rather than generate it ourselves, something that is much more difficult and not immediate. This system we live gives us all procesed, fast and easy, and it's a real adventure to get out of that scheme and build ourselves.
The only activity that has affected my hppd is the social life "at night". Even before the incident i had a tendency to lock me in my house and depresse me, something with I have to fight even more now. For the rest, the daily routine remains the same: work in the morning, a short afternoon nap, gym, play a musical instrument, cooking and read before sleeping. Always if i can, i travel to any place far from the city, in touch with nature: D.