When I was in high school, I had lectures on the damage from drug abuse, they said that there are type of sensitive people (1 out of each 10) experiencing panic and anxiety when using the drugs, precisely those people injured much more. Unfortunately, I realized this immediately after smoking and not before. I understand what things make feeling HPPD, these are mood/panics/social anxiety/sit for long on the computer - all of this worsens 70% the HPPD. So, if you will happy/tranquility/social active/make sport that HPPD can be felling only 30% and even less than. Hope my English is not so bad to not understand what I wrote...