I usually prefer any experience alone, and smoking is no exception. Smoking with people is fun, too; I like a mix of both. I've rarely seen weed as strong or rare enough to need to plan around the use of it, so I've never really been in the position of deciding to smoke, then deciding whether to do it alone or with friends. When I've smoked with friends, it's typically been because either 1) I was with them and we decided to smoke, or 2) I was contacted by someone inviting me to a smoking session. When I've smoked alone, it's been because I had weed and felt like it.