Just one further point on this article:
Considering that Tobacco is a consumer staple, one would have to exclude many ETF and possibly S&P 500 in order to obtain a tobacco free investment portfolio which for an investment professional would not alone be irrational it would also be unethical and from the stand point that in the CFA institute ethical guidelines you are supposed to :
Place the integrity of the investment profession and the interests of clients above their own personal interests.

Tobacco free investment seems to be a personal crusade for the writer here as they say that after their work in hospitals they decided to pioneer tobacco free investing.