the boston pops last night. ♪ you see that tacko rocking the size 48 double extra long tuxedo, alisyn, 7'5", i tell you what, looked like a natural. >> is that a legit move from an orchestra perspective? >> who knows what the legit moves of conducting are. >> it's a lost art. >> you're feeling the tones, you've got to do it. >> that's right. thank you very much. now to the latest on the deaths and illnesses from vaping. the cdc says the number of people getting sick and dying from e-cigarettes is starting to slow down, but with more than 50 people dead and 2,500 others sick, the agency is still working to pinpoint the exact cause of the illness. as dr. sanjay gupta reports,