Used to be a very heavy pot smoker....in princible i wouldnt have anything against it. But i know that it didnt help me have 3 years of being single. It makes you paranoid and less outgoing, less able to have a conversation with someone - therefore less likely to meet anyone. If you are in a relationship the mood swings, paranoia and anxiety can ruin it, partly cos it leads to anxious, uncomfortable silences....but depending on the person can make real paranoia worse as well - leading to mistrust and some very dark thoughts.
Smoking heavily its hard to maintain any sort of life.