|On or off the wagon?|
One of those toxins - the bandwagonist!
A bandwagonist, or wagonist, is
...someone who mindlessly goes along with an action or idea, without any real reason, other than other people are doing it.
It can also refer to a person who tends to not really be committed to something or someone as the case may be, and gets on and off that wagon when it suits them.
As per the second definition, there are lots of them out there in real life. People who flip flop, or who align themselves to something or someone when they damn well feel like it.
For example, while I took a mini hiatus from the gym for the holidays (bad, bad, bad idea, friends), I am one of a small and loyal group of pre-dawn gymophiles - always in the gym before 5am and not for any reason but it's part of my routine (whether I look like Jane Fonda or not). Here comes Carnival season and now I am going to have to contend with the once-a-year fitness buffs - all those men and women who want to work miracles with their 1-packs and glutes so they can fit into skimpy costumes in less than a month's time. Fighting for equipment, showers etc. After Carnival, they're gone until next year around this time.
Those are the worst kind, and I am locking the wagon so they don't get back on to inflict their flip-floppiness on my life. It's just too tiring at this point.