Of course, ayahuasca ( https://en.wikipedia.org/wiki/Ayahuasca ), when used properly, can make you cigarette AND weed free.

Second round was assumed to be milder
It had been assumed that a second round of Covid would be milder, as the body would have learned to fight the virus the first time around. It is still unclear why the Nevada patient become more severely ill the second time. One idea is he may have been exposed to a bigger initial dose of the virus. It also remains possible that the initial immune response made the second infection worse. This has been documented with diseases like dengue fever, where antibodies made in response to one strain of dengue virus cause problems if infected by another strain. Prof Paul Hunter, from the University of East Anglia, said the study was "very concerning" because of the small gap between the two infections, and the severity of the second. Given the fact that to date over 37 million people have had the infection, we would have expected to have heard of many more incidents if such very early reinfections with severe illness were common. "It is too early to say for certain what the implications of these findings are for any immunisation programme. But these findings reinforce the point that we still do not know enough about the immune response to this infection." 

BBC News - Covid reinfection: Man gets Covid twice and second hit 'more severe'
https://www.bbc.co.uk/news/health-54512034