I do also wonder how the difference in workload at Universal might have impacted on Curly's health, as Feature Length comedies then rather tended towards padding of some scenes that often involved different players. Would a longer lifespan for Jerome "Curly" Howard have resulted?
1934 - 1950, they worked only 5 - 6 weeks per year at Columbia doing the shorts. That studio's demands had no impact on Curly's health, and ongoing tales to the contrary (i.e., the Fleming book) are myths.
Any workload that contributed to his self-destructive lifestyle/habits were the team's own personal appearance bookings, which took up an average of 20 weeks per year during their mid-'30s to mid-'40s height, with 1939 and 1940 the most at 6 and 7 months respectively.