Vapour not smoke. A long haul will produce more.
I stay as far away from smoking areas as I can. After 3 years smoke free I'm very sensitive to smoke and find it difficult to take even in small doses. Different municipalities/towns/cities have different rules so I am more stealthy in those areas.Being considerate is key for vaping to become better accepted by the public I believe, so am never an in your face vaper. Exhale fast and low, use high PG, take smaller toots when people are around.
I vape in my doctors office, buses, church, line ups, shopping etc. but do NOT chuck huge clouds everywhere or fog out an area.
Simple answer...almost everywhere with respect and better judgement.
Cheers.