STRENGTHS
No ash trays
No yellow fingers
No coughing
No Wheezing
No ash tray mouth
No grimy build up as opposed to smoke
WEAKNESSES
Ease of use compared to just lighting up
Learning curve compared to just lighting up
Bad/rogue producers could be the rotten apple that ruins the basket
OPPORTUNITIES
As a relatively new industry there's lots of room for growth and improvement
THREATS
Lack of public knowledge
Lack of peer reviewed studies
Distrust, likely thanks to the tactics of big tobacco remaining in the collective memory
Disorganized. Despite attempts the industry itself doesn't seem to have a central organizing body prioritizing threats politically or prioritizing what studies should be backed and in what order.
So far, from the top of my head.